A slow or completely blocked drain is one of the most common household problems. The approach differs depending on which drain is clogged and what is causing the blockage. Here is how to clear every type of residential drain clog, starting with the simplest methods and escalating to more involved fixes.

How to Unclog Any Drain

Kitchen Sink

Kitchen sink clogs are usually caused by grease, food debris, and soap buildup.

Step 1: Boiling Water

Boil a full kettle of water and pour it directly down the drain in two or three stages, waiting a few seconds between each pour. Hot water melts grease and pushes soap buildup through the pipe. This alone clears many slow kitchen drains.

Do not use boiling water on PVC pipes if you are unsure of your pipe material — very hot (but not boiling) water is safer for plastic pipes.

Step 2: Plunger

Fill the sink with 3 to 4 inches of water. If you have a double-bowl sink, block the other drain with a wet rag. Place a cup plunger over the drain and plunge vigorously 15 to 20 times. The water pressure often dislodges the clog.

Step 3: Clean the P-Trap

Place a bucket under the sink. Unscrew the slip nuts on the P-trap (the curved pipe section under the sink) by hand or with pliers. Remove the trap, clean out debris, and reassemble. This is where most kitchen clogs live.

Step 4: Drain Snake

If the clog is past the P-trap, feed a drain snake (auger) into the pipe opening in the wall. Crank the handle while pushing forward until you feel resistance, then continue cranking to break through or hook the clog. Pull the snake back slowly, pulling the clog with it.

Bathroom Sink

Bathroom sink clogs are almost always caused by hair wrapped around the pop-up stopper.

Remove the pop-up stopper by pulling it straight up or by unscrewing the pivot rod under the sink
Clean the accumulated hair and gunk off the stopper
Use a zip-it tool (a thin, barbed plastic strip) to fish hair out of the drain
Reassemble and test

This five-minute fix resolves 90 percent of bathroom sink clogs.

Bathtub and Shower

Hair and soap scum are the primary culprits.

Remove the Drain Cover

Shower drains typically have a screw-down or snap-in cover. Remove it and pull out visible hair accumulation with needle-nose pliers or a zip-it tool.

Plunge

For tub drains, block the overflow opening (the round plate above the drain) with a wet rag, then plunge the drain opening with a cup plunger. The overflow bypass can release pressure and make plunging ineffective if it is not sealed.

Drain Snake

Feed a drain snake through the drain opening or through the overflow opening (which provides a straighter path to the clog). Crank through the clog and retrieve.

Prevention

Install a hair catch screen over every shower and tub drain. Clean it weekly. A $3 screen prevents virtually all tub and shower clogs.

Toilet

Toilet clogs require a different approach because of the trapway shape.

Flange Plunger

Use a flange plunger (the one with the extended rubber lip), not a cup plunger. Insert the flange into the drain opening, ensuring a good seal. Push and pull vigorously — the back-and-forth water pressure dislodges most toilet clogs.

Toilet Auger (Closet Auger)

If the plunger fails, use a toilet auger. It has a rubber-coated tip that protects the porcelain and a bend that navigates the toilet’s internal trapway. Feed the cable in, crank through the clog, then pull back.

Hot Water and Dish Soap

For organic clogs (not toys or hard objects): squirt dish soap into the bowl and add a gallon of hot (not boiling) water from waist height. The soap lubricates while the water pressure pushes. Wait 15 minutes and try flushing.

Never use a drain snake designed for sinks in a toilet — it will scratch the porcelain.

Floor Drains

Basement and garage floor drains clog with sediment, debris, and sometimes tree roots.

Remove the drain cover
Check for standing water and debris — scoop out what you can
Feed a drain snake (a longer model, 25 to 50 feet) into the drain
If you encounter significant resistance that does not clear, the issue may be roots or a broken pipe — this requires a professional with a power snake or camera

What NOT to Do

Avoid chemical drain cleaners. Products like Drano and Liquid-Plumr contain caustic chemicals that:

Damage older pipes (especially metal pipes)
Can splash back and cause chemical burns
Often fail on solid clogs (hair, grease buildup, objects)
Poison the water supply
Make the situation worse if the drain needs professional snaking (the technician now has to work with caustic water in the pipe)

Mechanical methods (plunging and snaking) are safer, more effective, and cheaper in the long run.

When to Call a Plumber

Multiple drains in the house are backing up simultaneously (main sewer line issue)
Drain snaking does not resolve the clog
Water backs up into other fixtures when you flush or drain
You smell sewer gas from drains
The clog recurs repeatedly in the same drain (possible pipe damage or root intrusion)

Most individual drain clogs are quick DIY repairs. Keep a plunger, a drain snake, and a zip-it tool on hand, and you will handle the majority of clogs before they become emergencies.