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Clearing a clogged drain

Plunge first: a cup plunger for sinks and tubs, a flange plunger for toilets. Seal the other side of a double sink, or the overflow hole, so the pressure goes into the clog. If that fails, use a hand snake while wearing gloves and safety glasses. Chemical drain cleaners are a last resort. They can burn skin and eyes instantly, so never mix them with anything. If it's still clogged, or several drains back up at once, call your landlord or a plumber.

Easy10–30 min to do$Checked October 2, 2026

Do it like this

  1. Stop running water into the drain, so it doesn't overflow while you work.
  2. Pick the right plunger. A cup plunger works best for sink and tub or shower drains. For a toilet, use a flange plunger, which has a soft rubber flap on the bottom that seals better. Source: Consumer Reports
  3. Seal the other opening. On a double sink, cover the drain you're not plunging so the plunger can build the pressure it needs. Source: Consumer Reports Do the same with the small overflow hole near the top of most bathroom sinks and tubs (a wet rag works).
  4. Plunge. Make sure the cup is covered by water and sealed over the drain, then push and pull firmly a number of times before lifting. A plunger may work if the blockage is in or near the trap, the U-shaped pipe under the drain. Source: Consumer Reports
  5. Snake it if plunging fails. A snake is a metal cable with a corkscrew-shaped spring on the end. You feed it into the pipe so it hooks the clog, then pull it out. Snakes are better than plungers at clearing the sludge that causes the next clog. Wear safety glasses and gloves, because dirty water and debris can splash. Source: Consumer Reports
  6. Use chemicals only as a last resort, and follow the label exactly. Wear rubber gloves and safety glasses, open a window or run a fan, and keep kids and pets away. Source: Consumer Reports Pour from close to the drain. Splash-back happens when cleaner is poured from too high, or when too much goes into a completely blocked drain. Source: Poison Control
  7. Still clogged? Call your landlord or a plumber. What looks like one stuck drain can actually be a blockage in a bigger branch line or the building drain. Source: Consumer Reports If you already poured in a drain cleaner, tell them, so they can protect themselves from the lye. Source: Consumer Reports
Watch out Caustic drain cleaners burn skin, eyes, mouth and throat on contact, instantly, and the injury can't be reversed, only treated. Source: Poison Control Never mix drain cleaners with each other or with other chemicals like bleach. Source: Consumer Reports Mixing some cleaners, like bleach with ammonia or acid, can make toxic fumes. Source: Poison Control Don't use chemicals in a toilet: the heat of the reaction can crack porcelain. Source: Consumer Reports And never pour cleaner into a drink or food container. Source: Poison Control

If it doesn't work

  • Drain cleaner splashed in your eyes or on your skin? Rinse immediately with running water for at least 20 minutes, taking off any clothing with cleaner on it, then call Poison Control at 1-800-222-1222 or use webPOISONCONTROL online. Source: Poison Control
  • Breathed in fumes? Get to fresh air right away, then contact Poison Control. Source: Poison Control Someone swallowed it? Give a small amount of water or milk right away, then contact Poison Control. Source: Poison Control If they collapse, have a seizure, have trouble breathing or can't be woken up, call 911. Source: Poison Control
  • Thinking about baking soda and vinegar? Poison Control explains that drains aren't airtight, so the gas mostly escapes, and the mix is unlikely to be strong enough for tough grease clogs. Source: Poison Control
  • Want something gentler? Enzyme drain cleaners are safer for pipes and septic systems, but they're slower: leave them for hours or overnight, sometimes more than once. Source: Consumer Reports
  • Flimsy, accordion-style plastic pipe under the sink? Chemical cleaners create heat and have been known to melt cheap, non-code replacement pipes. Old, rusted plumbing is a concern too. Source: Consumer Reports Plunge or snake instead.
  • Toilet overflowing? Turn off the water valve behind it first. See Finding your water shutoff and breaker panel.

Good to know

Which drain, which fix

Bathroom sink or tub, usually hair and soap scum: cup plunger with the overflow sealed, then a snake. Kitchen sink, usually grease and food: plunger with the other basin covered, or snake the side without the disposer. Source: Consumer Reports Toilet: flange plunger, never chemicals. Source: Consumer Reports Several drains at once, or water coming up in a tub when you flush: call your landlord or a plumber, since that points to a bigger line. Source: Consumer Reports

Preventing the next one

Wipe grease out of pans with a paper towel and throw it away. Collect fat in a jar, let it harden, and toss it. Source: Consumer Reports Poultry skin, potato peels, rice, celery, banana peels and pumpkin pulp are hard on a garbage disposer, so put them in the trash. Run cold water for 15 seconds before and after using the disposer, and turn it on before adding food. Cotton balls and swabs go in the trash, not the toilet. Source: Consumer Reports

Storing drain cleaner

Buy only what you need. Keep it in its original container with the child-resistant cap on tight, locked out of sight and reach of kids and pets. Source: Poison Control

Reporting it (script)

"Hi, the bathroom sink in unit 4B has been draining slowly for a week and is now fully clogged. I tried a plunger and a hand snake. I have not used any chemical cleaner. Can someone come take a look? I'm home after 5." Put it in writing, keep a copy, and say whether you used chemicals.

Slow drain (made-up example)

Jordan's shower takes forever to drain. Jordan pulls off the drain cover, wears gloves, pulls out a clump of hair, then plunges with the overflow covered by a wet rag. It drains. Jordan buys a $3 hair catcher.

Sources

  1. Consumer Reports How to choose and use a drain cleaner
  2. Consumer Reports Don't let a clogged drain ruin your Thanksgiving
  3. Poison Control (National Capital Poison Center) Caution with caustics
  4. Poison Control (National Capital Poison Center) What's in drain cleaner?
  5. Poison Control (National Capital Poison Center) Poison Control home: get help

Lesson T1.3 · Last checked October 2, 2026 against the sources listed.

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