How to Unclog Sink: 7 Easy Ways

A slow or clogged sink drain is one of the most common household plumbing problems — and one of the most fixable. Work through these methods in order, from simplest to most involved. Most sink clogs (hair, soap scum, grease, food debris) surrender to one of the first four.

1. Check the garbage disposal

If your kitchen sink is clogged and you have a disposal, start there. With the disposal switched on, run hot tap water for a couple of minutes — that alone often clears a minor jam. If the disposal hums but doesn’t spin, turn it off and press the reset button on the bottom of the unit, then try again. If it still won’t run, the disposal itself may need repair — see our guide on fixing a garbage disposal.

2. Plunge the sink drain

For sinks, use a cup plunger — the simple bell-shaped kind, which is designed for flat drains like sinks and tubs. (The flange-style plunger with the fold-out flap is for toilets.)

1. Remove any drain cover or pop-up stopper you can.
2. If you have a double sink, seal the other drain with a wet rag or stopper so pressure goes to the clog, not the second basin.
3. Fill the sink with enough water to cover the plunger’s bell.
4. Seat the plunger over the drain and pump vigorously for 20–30 seconds.
5. Remove the plunger and run warm water for a minute to check flow. Repeat if needed.

3. Hot water flush

Often the simplest fix: heat a kettle or large pot of water until steaming and pour it slowly down the drain in stages. Heat melts grease and softens soap scum. Caution: if your drain pipes are PVC, use very hot tap water rather than a full rolling boil — boiling water can soften PVC joints over time.

4. Dish detergent

Dish soap is an excellent degreaser, which makes it genuinely useful on greasy kitchen-sink clogs — unlike some internet-famous “home remedies” (see the note below).

1. Squeeze about half a cup of dish detergent directly into the drain (a full cup for a stubborn clog).
2. Let it sit for 30 minutes so it coats the pipe walls and works into the grease.
3. Follow with a kettle of hot — not boiling, if you have PVC — water, poured slowly.
4. Run hot tap water to flush. Repeat once if drainage is still slow.

A note on baking soda and vinegar: you’ll see this recommended everywhere, but the fizzing reaction is just carbon dioxide and water — it doesn’t dissolve hair, grease, or soap scum. At best it does nothing; at worst it wastes your time while the clog hardens. Stick with the methods above.

5. Fish it out with a wire hanger

For bathroom sinks, the clog is often a wad of hair sitting just below the drain. Straighten a wire coat hanger, bend a small hook in the end, and carefully fish it through the drain to snag the hair. Go gently to avoid scratching a porcelain or stainless sink.

6. Use a drain snake

A hand-crank drain snake (auger) reaches clogs a hanger can’t. Feed the cable into the drain until you feel resistance, crank the handle to bite into the clog, then retract — the clog usually comes out with the cable. For a stubborn kitchen clog, you may need to remove the P-trap under the sink and snake directly into the wall pipe (see below).

7. Remove and clean the P-trap

The P-trap is the curved section of pipe under the sink — clogs love to settle in its bend.

1. Put on gloves and place a bucket under the trap to catch water and debris.
2. Loosen the slip nuts on both ends of the trap with channel-lock pliers or a wrench.
3. Remove the trap, dump the contents into the bucket, and rinse it thoroughly.
4. Reinstall, hand-tighten the slip nuts, then snug them with the wrench — don’t overtighten, which can crack the nuts.
5. Run water and check for leaks at both connections.

Why you should skip chemical drain cleaners

Products like Drano and Liquid-Plumr generate heat and corrosive chemical reactions inside your pipes. They can damage metal and plastic pipe, destroy the rubber seals in your P-trap, and they’re hazardous to skin and eyes — and if they don’t clear the clog, you’re left with a sink full of caustic water. Mechanical methods above are safer and usually more effective.

Preventing future sink clogs

• Never pour grease or cooking oil down the drain. It solidifies as it cools and coats pipe walls. Let it cool, then throw it in the trash.
• Use a sink strainer or hair catcher, especially in bathroom sinks and tubs.
• Wipe plates and pans with a paper towel before washing.
• Clean the pop-up stopper regularly — hair wraps around it constantly.
• Flush drains with hot water for 30 seconds after heavy use to keep grease moving.
• Don’t put coffee grounds, eggshells, or fibrous foods (celery, onion skins) down the kitchen drain.

When to get help

If every drain in the house is slow, the problem is likely in the main sewer line — not the sink. And if you’ve snaked and cleaned the trap with no improvement, the clog may be deeper in the wall or branch line where professional equipment is needed.

America’s Service Plumber is a free matching service. We’ll connect you with licensed local plumbers in your area for free quotes — no obligation. Get a free quote.