How to Unclog a Kitchen Sink: 6 Methods from Easiest to Most Powerful

A slow or completely blocked kitchen sink is frustrating — but in most cases, you can fix it yourself in minutes without calling a plumber. Kitchen sink clogs are almost always caused by grease, food particles, and soap scum buildup in the drain pipe. Here are 6 methods, starting with the easiest.

Method 1: Boiling Water (Easiest, Try First)

For grease and soap buildup, boiling water is often all you need.

1. Boil a full kettle of water.
2. Pour it slowly down the drain in 2-3 stages, waiting 30 seconds between each pour.
3. The heat melts grease and flushes it through the pipe.

Note: Don't use boiling water on PVC pipes — use very hot tap water instead.

Method 2: Baking Soda and Vinegar

1. Pour ½ cup of baking soda down the drain.
2. Follow immediately with ½ cup of white vinegar.
3. Cover the drain with a plug or cloth to force the reaction downward.
4. Let fizz for 15-30 minutes.
5. Flush with a full kettle of hot water.

Method 3: Dish Soap and Hot Water

For grease clogs:

1. Squirt a generous amount of dish soap down the drain.
2. Follow with a kettle of very hot water.
3. The dish soap breaks down grease while the hot water flushes it through.

Method 4: Plunger

1. Fill the sink with enough water to cover the plunger cup.
2. Place a cup plunger over the drain opening.
3. Plunge vigorously 10-15 times, maintaining a seal.
4. Pull the plunger up sharply on the last stroke to create suction.
5. Run hot water to flush the loosened clog.

Method 5: Drain Snake (Drain Auger)

For solid blockages that don't respond to the above methods:

1. Insert a drain snake into the drain opening.
2. Feed it down until you feel resistance — that's the clog.
3. Rotate the handle to break up or hook the blockage.
4. Pull out the snake (and the clog material) slowly.
5. Run hot water to flush remaining debris.

Method 6: Clean the P-Trap

If nothing else works, the clog is likely in the P-trap — the curved pipe under the sink.

1. Place a bucket under the P-trap to catch water.
2. Unscrew the slip nuts on both ends of the P-trap by hand or with pliers.
3. Remove the P-trap and clear out any blockage.
4. Rinse the P-trap in another sink.
5. Reattach and run water to check for leaks.

Preventing Kitchen Sink Clogs

• Never pour grease or oil down the drain — collect in a jar and dispose in the trash.
• Use a drain strainer to catch food particles.
• Run hot water for 30 seconds after every use to flush the drain.
• Pour baking soda and vinegar down the drain monthly as preventive maintenance.

Frequently Asked Questions

What dissolves grease in a kitchen drain?

Boiling water, dish soap, and baking soda with vinegar all dissolve grease effectively. For severe grease buildup, a commercial enzyme drain cleaner works well without damaging pipes.

Can I use chemical drain cleaner in my kitchen sink?

Chemical drain cleaners (like Drano) work but can damage pipes with repeated use and are harmful to the environment. Try the natural methods first — they work for most kitchen clogs.

Why does my kitchen sink keep clogging?

Recurring clogs usually mean grease is building up in the pipe walls. Stop pouring grease down the drain, use a drain strainer, and do a monthly baking soda and vinegar flush to keep the drain clear.

How do I unclog a double kitchen sink?

Block one drain with a wet cloth before plunging the other — this forces pressure toward the clog rather than out the other drain. If both sides are blocked, the clog is likely in the shared drain pipe below the P-trap.