Drain Cleaning in Chicago: The Complete Guide to Every Drain in Your Home, When to Call a Pro, and What It Costs in 2026

Everything Chicago Homeowners Need to Know Before the Next Slow Drain Becomes an Emergency

 

Most Chicago homeowners don’t think about their drains until one of them stops working. By that point — water backing up in the shower, the kitchen sink draining at the speed of a reluctant glacier, a basement floor drain bubbling up with something that shouldn’t be there — the drain has been telling them something was wrong for weeks. The slow drain that got ignored became the full backup that required an emergency call.

 

Drain cleaning is one of those maintenance categories that falls through the cracks of home ownership because drains don’t announce their condition the way a water heater does when it starts making noise or a toilet does when it runs all night. They just gradually get slower and slower until the day they stop. By the time the problem is obvious, the underlying cause has usually been building for months.

 

This guide covers everything Chicago homeowners need to know about drain cleaning — from the different types of drains in a home and what each one handles, to the specific reasons Chicago drains fail faster than those in most American cities, to the right cleaning method for each situation, to how often each drain type needs service, and what everything costs in the 2026 Chicago market. It also covers when you can address a drain problem yourself and when professional service is the only appropriate response.

 

The Drain System in a Chicago Home: Understanding What You Have

 

Before getting into cleaning methods and warning signs, it helps to understand what drain system you actually have and how all the pieces connect.

 

The Hierarchy of Drains

 

Your home’s drain system is a hierarchy — multiple small lines feeding into larger shared lines, all ultimately connecting to a single exit point at the city sewer main.

 

Fixture drains are the individual drains at each sink, shower, tub, and toilet. These handle the waste from a single fixture and connect through a P-trap and a branch line to the main drain stack.

 

Branch lines are the horizontal pipes running inside walls and under floors that collect waste from multiple fixtures on the same floor or in the same area and route it to the main stack. A branch line might serve the bathroom sink, tub, and toilet from a single bathroom, or combine the kitchen sink drain with the dishwasher connection before reaching the stack.

 

The main drain stack is the large vertical pipe — typically 3 or 4 inches in diameter — that runs vertically through the house from the basement to the roof vent. All branch lines connect to it, and it collects waste from the entire house before routing it to the building drain.

 

The building drain is the horizontal pipe in the basement that carries all household waste from the base of the stack to the point where it exits the foundation. It connects to the sewer lateral outside.

 

The sewer lateral is the private underground pipe that runs from the house to the city sewer main in the street. It’s the homeowner’s responsibility from the foundation to the main — and it’s the most expensive component to repair when it fails.

 

Understanding this hierarchy matters for drain cleaning because a slow drain’s cause may be anywhere in the chain between the fixture and the city main. Getting the diagnosis right before treating identifies exactly where in the system the problem lives — which determines the right cleaning method and the right scope of work.

 

What Chicago Homes Actually Have Inside Their Walls

 

The pipe material inside Chicago’s older housing stock is fundamentally different from what’s in most newer American homes:

 

Cast iron drain lines in Chicago’s pre-1970 housing stock are now 50 to 80 years old. Cast iron corrodes from the inside out — the interior surface that was once smooth becomes increasingly rough with rust pitting and scale buildup over decades. That rough interior catches debris, accumulates grease, and develops blockages faster than smooth PVC in newer homes. A drain branch that’s never been professionally cleaned in a 1960s bungalow may have decades of accumulated grease, soap scum, and mineral deposits that no amount of over-the-counter product will touch.

 

Galvanized steel supply pipes in homes built before 1960 are corroding internally and narrowing — but they also affect drain performance indirectly by contributing mineral-laden water that deposits scale throughout the drain system.

 

Clay tile sewer laterals in many older Chicago neighborhoods are the most vulnerable component in the entire system. Clay tile joints offset over decades of ground movement and freeze-thaw cycling, allowing root intrusion and creating partial blockages that can’t be cleared by standard drain cleaning from inside the house.

 

Why Chicago Drains Fail Faster Than They Should

 

Three specific factors make drain maintenance in Chicago more demanding than in most comparable American cities.

 

Hard Water Mineral Deposits

 

Chicago’s municipal water averages 130 to 150 parts per million of dissolved calcium and magnesium — classified as moderately hard to hard. These minerals don’t just affect supply pipes and water-using appliances — they affect drain pipes too. As warm water cools in drain lines, minerals precipitate out of solution and deposit on pipe walls. This mineral scale creates rough surfaces that catch grease and debris, narrows effective pipe diameter, and makes accumulation happen faster with each passing month.

 

The EPA’s WaterSense Home Maintenance program notes that proper home plumbing maintenance includes monitoring for the effects of mineral-laden water on plumbing components — effects that are significantly more pronounced in Chicago’s water conditions than the national average.

 

The FOG Problem From Chicago’s Food Culture

 

Fats, oils, and grease — collectively called FOG — are the primary drain killer in residential Chicago kitchens. Chicago’s food culture is heavy, rich, and fat-intensive. Bacon grease, cooking oil from deep-frying, butter, the fat that renders off meat during cooking — all of it eventually finds its way to the kitchen drain. Even small amounts of hot FOG that seem to wash down easily cool within the first few feet of pipe, solidify on the pipe walls, and build layer by layer over months and years. Combined with Chicago’s hard water mineral deposits, the resulting accumulation in cast iron kitchen drain lines can be dense, dark, and virtually impervious to chemical drain cleaners.

 

The Combined Sewer System

 

Chicago and most inner-ring suburbs operate on a combined sewer system that carries both stormwater and sanitary waste in the same underground pipes. The MWRD’s Understanding Your Sewer resource explains how this system works and why it creates specific challenges for Chicago homeowners. During heavy rain events, the combined system surcharges — pressure builds in the mains and travels backward through residential laterals. The result is water coming up through basement floor drains from the city’s system rather than from anything inside the home.

 

This surcharge mechanism means that a basement floor drain backup during or after heavy rain in Chicago is almost never a drain cleaning problem — it’s a backflow prevention problem. Getting this distinction right prevents spending money on drain cleaning that won’t address the actual cause.

 

Every Drain Type in Your Home — Warning Signs and What They Need

 

Kitchen Sink Drain

 

The kitchen drain handles the highest FOG loading of any residential drain and is the most commonly clogged drain in Chicago homes. It connects through the P-trap under the sink, through the drain arm to the wall, and then through a branch line to the main stack or in some Chicago homes to an outdoor catch basin before the lateral.

 

Warning signs:

 

• Slow drainage that progressively worsens over weeks

 

• Gurgling sounds from the drain when water is released

 

• Gurgling in the kitchen drain when the dishwasher runs — indicating a shared line restriction

 

• Odors rising from the drain opening

 

• Drain backing up when using the dishwasher

 

What it needs: The kitchen drain branch should be professionally cleaned every 12 to 18 months in a typical Chicago household. Homes with heavy cooking or garbage disposal use need more frequent service — every 8 to 12 months. Recurring kitchen clogs despite regular cleaning indicate that rodding is only temporarily opening the restriction and hydro jetting is needed to actually clean the pipe walls.

 

For a comprehensive breakdown of kitchen drain diagnosis, what garbage disposals do to drain lines, and all kitchen plumbing costs, see our complete Chicago kitchen plumbing guide.

 

Bathroom Sink Drain

 

The bathroom sink drain handles hair, soap scum, toothpaste, and personal care product residue. The primary accumulation location is the pop-up pivot rod just below the stopper opening, where hair wraps and accumulates — not deep in the drain system. Most bathroom sink drain slowdowns are addressable by removing the pop-up stopper and cleaning the pivot rod — a free fix that takes five minutes. When the drain remains slow after cleaning the pop-up, the restriction is further down in the drain arm or P-trap and requires professional service.

 

Warning signs:

 

• Slow drainage that doesn’t improve after cleaning the pop-up

 

• Water pooling in the sink bowl during use

 

• Odors from the drain even when the P-trap is full

 

What it needs: Professional drain cleaning every 2 to 3 years for most bathrooms, more frequently in households with heavy use or long hair.

 

Shower and Tub Drain

 

The shower drain handles the highest volume of hair and soap scum of any bathroom drain and requires the most consistent maintenance. A drain strainer that catches hair before it enters the pipe is the single most effective prevention available — cleaning it after every shower takes 10 seconds and prevents the accumulation that otherwise requires professional service every few months.

 

Warning signs:

 

• Water pooling at your feet during a shower that takes more than 60 seconds to drain after you step out

 

• Standing water in the tub after bathing

 

• Slow drainage that doesn’t improve with surface hair removal

 

What it needs: Professional drain cleaning annually for most showers, or when hair removal at the drain surface doesn’t fully restore drainage.

 

For a comprehensive breakdown of shower and tub drain issues, overflow assembly leaks, and shower pan problems, see our complete Chicago bathroom plumbing guide.

 

Toilet Drain

 

The toilet drain handles the highest-volume flushing of any fixture — each flush pushes 1.28 to 1.6 gallons of water through a 3 to 4-inch drain at high velocity. Toilet clogs are almost always localized in the toilet trap rather than the drain branch line — caused by too much toilet paper, “flushable” wipes that don’t break down, or foreign objects. A flange plunger clears most toilet clogs. Recurring toilet clogs after successful plunging, or clogs that don’t respond to plunging, require professional drain rodding.

 

Warning signs:

 

• Toilet flushes but water rises in the bowl before draining slowly

 

• Multiple plunging attempts required to clear the same toilet repeatedly

 

• Gurgling from the toilet when other drains are used — indicating a main line restriction

 

• Sewage odors from the toilet even when it appears clean

 

What it needs: Most toilet clogs are isolated events rather than maintenance items. Recurring clogs in the same toilet warrant professional assessment to determine whether the problem is in the toilet trap, the drain branch, or the main sewer line.

 

Floor Drain

 

The basement floor drain is the most overlooked and most important drain in many Chicago homes. It’s designed to handle emergency water — a burst pipe, water heater failure, or laundry overflow — by directing the water to the sewer system rather than letting it flood the basement. In homes connected to a combined sewer system, it’s also the first place sewer surcharge backup appears during heavy rain events.

 

Floor drains that aren’t used regularly can develop dry P-traps — the water seal in the trap evaporates, allowing sewer gases to rise into the basement. Pouring a gallon of water into infrequently used floor drains refreshes the water seal and prevents this. Adding a small amount of mineral oil to the trap extends the water seal by slowing evaporation.

 

Warning signs:

 

• Sewage odor from the floor drain area in the basement (often indicates dry trap or surcharge conditions)

 

• Water backing up through the floor drain during heavy rain (sewer surcharge — not a cleaning problem)

 

• Floor drain failing to clear water during normal basement water events

 

What it needs: Floor drain cleaning when accumulation is visible or drainage is slow. P-trap refreshing quarterly with water for drains that aren’t regularly used. Assessment of surcharge backup risk if water backs up through the floor drain during rain events.

 

Laundry Drain

 

The laundry drain handles lint, detergent residue, fabric softener, and in older homes, the remnants of everything that comes out of a washing machine load. Laundry drain standpipes can accumulate lint and detergent buildup over time, creating a slow drain that causes the washing machine to overflow the standpipe during spin cycles.

 

Warning signs:

 

• Water backing up and overflowing the standpipe during washing machine drain cycles

 

• Slow drainage from the laundry sink if present

 

• Detergent odor from the drain area indicating residue buildup

 

What it needs: Professional rodding of the laundry drain branch every 2 to 3 years in most Chicago homes, more frequently if heavy detergent use is contributing to accumulation.

 

The Main Sewer Lateral — The Most Critical Drain in the House

 

The sewer lateral is not a drain that most homeowners think about — it’s underground, invisible, and out of mind until it fails. But it’s the single drain whose failure affects every other drain simultaneously, and it’s the most expensive plumbing repair most homeowners will face.

 

In Chicago’s older neighborhoods, sewer laterals are often original clay tile pipe — installed when the home was built in the 1920s, 1940s, or 1960s. Clay tile laterals are vulnerable to root intrusion at pipe joints and to offset joint movement from decades of freeze-thaw cycling. A clay tile lateral with significant root intrusion causes recurring main sewer line backups that affect every fixture in the house simultaneously — all drains are slow, toilets flush sluggishly, and the basement floor drain may back up.

 

Warning signs of a main sewer line problem:

 

• Multiple drains in the house are slow or backing up simultaneously

 

• Gurgling in one drain when another is used — air being displaced through the shared stack

 

• Basement floor drain backs up when upstairs fixtures are used

 

• Sewage backup in the basement during normal household water use (distinct from rain-related surcharge)

 

The MWRD’s Understanding Your Sewer resource covers how Chicago’s combined sewer system works and why understanding it is essential for diagnosing whether a backup is coming from inside the home’s own drain system or from the city main during a surcharge event.

 

Drain Cleaning Methods: Rodding vs Hydro Jetting vs Camera Inspection

 

Understanding the three primary professional drain cleaning methods helps you evaluate contractor recommendations and know what to ask for when you call.

 

Drain Rodding (Mechanical Snaking)

 

Drain rodding uses a flexible steel cable with a cutting or clearing attachment to physically break through a blockage and push or pull it through the drain system. It’s fast, effective for acute clogs caused by solid material, and appropriate when the goal is restoring flow quickly.

 

Best for:

 

• Toilet clogs

 

• Shower and tub drains clogged with hair

 

• Kitchen drain acute blockages from food accumulation

 

• Main sewer line root cutting where roots have created a blockage but the pipe is otherwise sound

 

• Emergency backup situations where restoring flow immediately is the priority

 

Limitation: Rodding clears the obstruction but doesn’t clean the pipe walls. Grease deposits that rodding pushes through remain on the pipe interior and continue to accumulate, which is why rodded lines often develop the same blockage again within months. For pipes with significant wall accumulation, rodding is a temporary fix.

 

Our sewer rodding service covers the full Chicago and suburban service area with same-day and 24/7 emergency response.

 

Hydro Jetting

 

Hydro jetting uses high-pressure water — up to 4,000 PSI for residential drain work — to simultaneously cut through blockages and scour the pipe walls clean. The result is a pipe interior that’s returned to near-original condition — grease deposits, mineral scale, soap scum, and root stubs all removed. The cleaned pipe starts the next accumulation cycle from a genuinely clean baseline, which meaningfully extends the time between service needs.

 

Best for:

 

• Kitchen drain lines with significant grease accumulation

 

• Bathroom drain lines with years of soap scum buildup

 

• Main sewer lines with root intrusion where the roots need to be flushed after cutting

 

• Any drain where rodding has been performed multiple times without lasting results

 

• Older Chicago homes with cast iron drain lines that have never been professionally cleaned

 

• Scheduled preventive maintenance where the goal is long-term performance rather than just restoring immediate flow

 

When NOT to use it: Pipes that are structurally compromised — partial collapses, severely deteriorated cast iron — may not be able to handle the pressure of hydro jetting. Camera inspection before jetting confirms pipe condition.

 

Our hydro jetting service is available throughout Chicago and the suburbs for both residential and commercial drain systems.

 

Sewer Camera Inspection

 

Camera inspection uses a waterproof camera on a flexible cable to visually assess the inside of drain pipes in real time. It identifies the nature, location, and extent of any problem — whether it’s grease accumulation, root intrusion, pipe belly, joint separation, or partial collapse — before any cleaning or repair work is done.

 

When camera inspection is the right first step:

 

• Multiple drains are slow simultaneously — indicates main sewer line issue that needs diagnosis before treatment

 

• Recurring clogs in the same drain despite repeated cleaning

 

• You’re buying or selling an older Chicago home and want to know the condition of the sewer lateral

 

• You’ve had a significant root intrusion clearing and want to confirm the pipe is structurally sound before deciding on repair vs. continued maintenance

 

• Any situation where you’re uncertain whether the problem requires cleaning, repair, or replacement

 

Camera inspection is the diagnostic tool that separates drain cleaning problems from drain repair problems — and in Chicago’s aging housing stock, that distinction matters enormously before money is spent.

 

DIY Drain Maintenance: What You Can Do vs What Requires a Pro

 

What Chicago Homeowners Can Effectively Do Themselves

 

Pop-up stopper cleaning. Removing and cleaning the pop-up assembly in bathroom sinks — specifically the hair accumulation on the pivot rod — is free, takes five minutes, and addresses the most common bathroom sink drain slowdown. This should be done monthly in most Chicago bathrooms.

 

Drain strainer maintenance. Cleaning a shower drain strainer after each use prevents most hair accumulation from entering the drain system. The strainer itself should be cleaned — not just rinsed — weekly.

 

Floor drain P-trap maintenance. Pour a gallon of water into infrequently used basement floor drains quarterly to maintain the water seal. Adding a small amount of mineral oil extends the seal between water additions.

 

Hot water flushing. Running very hot water through kitchen drains for 30 seconds after each significant cooking session helps liquefy and flush grease before it solidifies on pipe walls. This doesn’t replace professional cleaning but slows accumulation between service intervals.

 

Boiling water for minor kitchen clogs. A kettle of boiling water poured slowly down a kitchen drain can liquefy a fresh grease deposit that hasn’t fully hardened. This is only effective for very recent, minor grease accumulations — it won’t touch a hardened, months-old deposit.

 

Toilet plunging. A flange plunger clears the majority of toilet clogs. This is the appropriate first response to a toilet that won’t clear. Use a flange plunger (with the rubber flap that fits into the toilet drain), not a cup plunger designed for sink drains.

 

What Requires Professional Service

 

Any drain that doesn’t improve after DIY attempts. If the drain is still slow after cleaning the pop-up, plunging the toilet, or running hot water, the restriction is past the point where surface tools can reach it. Professional rodding or hydro jetting from a cleanout accesses the full drain line.

 

Recurring clogs that clear temporarily but return within weeks. The pattern of temporary clearance followed by quick recurrence almost always indicates either grease deposits on pipe walls (requires hydro jetting rather than rodding) or a structural issue in the pipe (requires camera inspection and assessment).

 

Multiple drains slow simultaneously. This is a main sewer line problem that requires professional diagnosis — camera inspection to identify what’s causing the restriction — before any cleaning. Attempting to clear individual fixture drains when the problem is in the main lateral wastes time and money.

 

Any backup with a sewage odor. If the water backing up through any drain smells like sewage, the source is either a main sewer line backup from inside the house or a sewer surcharge backup from the city’s system traveling backward through your lateral. Either situation requires professional assessment — not drain cleaning.

 

Chemical drain cleaners — know their limits. Chemical drain cleaners (Drano, Liquid-Plumr, and similar products) are effective for hair clogs in bathroom drains — the caustic chemicals dissolve the protein in hair effectively. They are largely ineffective against grease, which is the dominant clog material in Chicago kitchen drains. They can also damage older cast iron and galvanized pipes in Chicago’s pre-1960 housing stock with repeated use, and they create hazardous conditions if they fail to clear a clog — leaving caustic liquid that a plumber must then navigate around to perform the actual cleaning.

 

How Often Does Each Drain Need Professional Cleaning in Chicago?

 

The right service interval for each drain type depends on your specific household, but here are the ranges we see in practice across Chicago residential properties:

 

Kitchen drain: Every 12 to 18 months for a typical Chicago household. Every 8 to 12 months for households with heavy cooking, garbage disposal use, or pre-1970 cast iron drain lines.

 

Bathroom sink drain: Every 2 to 3 years for most bathrooms, assuming pop-up cleaning is performed monthly. More frequently in households with heavy bathroom use or long hair.

 

Shower and tub drain: Annually for most Chicago showers where a drain strainer is used consistently. Every 6 to 9 months without a strainer.

 

Floor drain: As needed when accumulation is visible or drainage is slow. P-trap refreshing quarterly regardless of whether cleaning is needed.

 

Laundry drain: Every 2 to 3 years for most Chicago homes.

 

Main sewer lateral: Camera inspection every 3 to 5 years for homes with original clay tile laterals in Chicago’s older neighborhoods. Professional rodding of the main line when any drain backup affects multiple fixtures simultaneously. Hydro jetting of the main line every 3 to 5 years in homes with significant root intrusion history.

 

What Professional Drain Cleaning Costs in Chicago in 2026

 

Bathroom sink drain cleaning (rodding): $100 to $250. Includes pop-up removal, pivot rod cleaning, and drain rodding to the branch line connection.

 

Shower and tub drain cleaning: $100 to $200 for standard hair and soap scum accumulation. Longer runs or additional access needed runs higher.

 

Kitchen sink drain cleaning (rodding): $150 to $350. Includes drain arm and branch line rodding to the stack or catch basin connection.

 

Kitchen sink drain cleaning (hydro jetting): $300 to $600. Appropriate for recurring clogs or grease-coated drain lines. Cleans the full pipe diameter rather than just opening a path through the clog.

 

Toilet drain cleaning (rodding): $150 to $300. Includes assessment to confirm clog is in the toilet trap rather than the branch line.

 

Floor drain cleaning: $100 to $250 for standard residential floor drain service.

 

Main sewer line rodding: $250 to $500 for standard main line clearing. Emergency after-hours service runs 25% to 50% higher.

 

Main sewer line hydro jetting: $400 to $900 for residential main sewer line. Appropriate for root intrusion cleaning, recurring backups, or pipes that haven’t been serviced in many years.

 

Sewer camera inspection: $200 to $450 for a residential sewer lateral camera inspection with video documentation. One of the highest-value diagnostic investments for any Chicago home with a pre-1970 clay tile lateral.

 

Whole-home drain cleaning package (multiple drains in a single visit): Many Chicago homeowners find value in scheduling cleaning for multiple drains in a single visit — kitchen drain, shower drains, and floor drain in one mobilization. Combined service is typically 15% to 25% less expensive than scheduling each drain separately.

 

Chicago-Specific Drain Cleaning Considerations

 

Know the difference between a drain clog and a sewer surcharge backup. As covered throughout this guide — a basement floor drain that backs up specifically during or after heavy rain is almost certainly a sewer surcharge event from the city’s combined system, not a drain cleaning problem. Spending money on drain cleaning in this situation provides no protection against the next storm. The solution is a backwater valve — a one-way valve installed in the main sewer lateral that physically prevents city sewer pressure from entering your home’s drain system. 

 

Cast iron drain lines benefit from hydro jetting rather than repeated rodding. If you’re in a pre-1970 Chicago home and have had the same drain rodded more than twice in a two-year period, hydro jetting is the appropriate next step. The cast iron pipe walls have enough interior corrosion that rodding opens a temporary path through accumulation that quickly rebuilds. Hydro jetting removes the wall deposits that create the accumulation surface — giving a genuinely clean pipe to start the next service cycle.

 

Older homes with no cleanout access are worth updating. A cleanout is a capped access point in the main drain line that allows rodding or hydro jetting equipment to be inserted without removing a toilet or accessing the system through a roof vent. Many older Chicago homes were built without cleanouts — or have buried cleanouts that aren’t accessible. Adding a cleanout at the base of the main drain stack is a one-time expense that reduces the cost and disruption of every future main sewer line service call for the life of the home.

 

Regular professional drain cleaning is far less expensive than the alternatives. The average professional drain cleaning service in Chicago runs $150 to $350 per drain. The average water damage repair from a backup event — drywall, flooring, contents replacement — runs $3,000 to $15,000. The average emergency plumbing call premium over standard rates runs 25% to 50% higher. The math of scheduled preventive maintenance almost always favors the annual service call over emergency response.

 

Frequently Asked Questions: Drain Cleaning in Chicago

 

My drain is slow but still drains. Should I wait until it’s completely blocked? No — a slow drain that still moves water is a drain in the early stages of restriction. A completely blocked drain is an emergency. The difference in service cost between clearing a slow drain and clearing a complete backup is often significant because a complete backup requires more aggressive work and potentially emergency call rates if it happens outside business hours. Address slow drains when they’re slow.

 

How do I know if my slow drain is a fixture-level problem or a main sewer line problem? Check all the drains in the house. If only one fixture is slow and all others are normal, the problem is in that fixture’s drain or branch line. If multiple drains are slow or backing up simultaneously, the problem is downstream of where all those drains connect — in the main sewer line.

 

Can I prevent kitchen drain clogs entirely? No — but you can dramatically slow accumulation. Never put cooking fat, oil, or grease down the drain. Run hot water for 30 seconds after each cooking session. Avoid putting fibrous vegetables, starchy foods, or coffee grounds through the garbage disposal. With these habits, most Chicago homeowners can extend their kitchen drain service interval significantly compared to homes without any prevention practices.

 

Is annual drain cleaning necessary for every drain or just the ones that have been slow? Annual cleaning is most valuable for kitchen drains — which handle the most demanding material — and for main sewer lines in homes with older clay tile laterals. Bathroom drains can typically go 2 to 3 years between professional service if pop-up maintenance is performed regularly. Floor drains should be cleaned when accumulation is visible rather than on a fixed schedule.

 

Chemical drain cleaners say they’re safe for pipes. Should I use them? With caution and specific expectations. Chemical drain cleaners work well for hair clogs in bathroom drains. They work poorly or not at all for grease clogs in kitchen drains. They should never be used on a completely blocked drain — the caustic liquid will sit in the pipe and create a hazardous situation for anyone who subsequently opens the drain for cleaning. In older Chicago homes with cast iron drain pipes, repeated chemical drain cleaner use can accelerate interior corrosion. They’re a reasonable first response for a slow bathroom drain; they’re not appropriate for kitchen drains or main sewer issues.

 

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