How to Fix a Slow or Clogged Drain
A slow drain is almost always a partial clog — hair and soap scum in bathrooms, grease and food debris in kitchens. Most clogs are in the P-trap or the top few feet of drain pipe and can be cleared without calling a plumber. Skip the chemical drain cleaners — they damage pipes over time and rarely clear full clogs.
Likely Causes
- 1Hair and soap scum buildup (bathroom sinks and showers)
- 2Grease and food particle accumulation (kitchen sinks)
- 3Foreign object (cap, cotton swab, etc.)
- 4Soap buildup on the drain stopper mechanism
- 5Deeper pipe blockage (if multiple drains are slow — main line issue)
Low urgency unless multiple drains are backing up simultaneously, which indicates a main line clog.
How to Fix It: Step by Step
- 1Remove and clean the drain stopper
Most bathroom sink stoppers lift out or unscrew. Pull it out, remove the hair and soap buildup, and run water to test.
- 2Use a drain snake or hair clog remover
Insert a plastic hair removal tool (Zip-It) or a 25-foot hand drain snake. Rotate and pull back. Hair clogs almost always come out within 12 inches of the drain opening.
- 3Try a drain plunger
Cover the overflow hole in the sink with a rag (to create suction). Place the cup plunger over the drain, fill with enough water to cover the cup, and plunge 10–15 times vigorously.
- 4Clean the P-trap
Place a bucket under the curved pipe beneath the sink. Unscrew the slip-joint nuts by hand (or with channel-lock pliers). Remove the P-trap, clean out debris, and reinstall.
- 5Test with hot water
Run the hottest tap water for 2–3 minutes. For kitchen drains, follow with a half cup of baking soda and a cup of white vinegar, wait 15 minutes, then flush with hot water.
Materials & Tools Needed
Warning Signs It's Getting Worse
- ⚠Multiple drains backing up at the same time
- ⚠Toilet bubbles or gurgles when you drain the sink
- ⚠Sewage smell from drains
- ⚠Water backing up into the tub when toilet is flushed
When to Call a Professional
Call a plumber if multiple drains are slow simultaneously (main line blockage), if you hear gurgling in other drains when you flush the toilet, or if snaking doesn't clear the clog.
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