Clear a Clogged Kitchen Sink Drain

Kitchen sink clogs are the most common plumbing problem in a house, and they stop you from using one of your most-used appliances. The blockage is usually grease, food debris, or soap buildup sitting in the trap or the main drain line. The good news is that most of these clogs are fixable in under an hour with tools you probably have, and you don't need a plumber. The key is knowing which method works for which type of clog—a plunger handles sudden blockages, a snake tackles deeper obstructions, and accessing the trap gets you to the worst offenders. Start simple, escalate only if needed, and you'll have water flowing again.

1. Set Up the Seal. Fill the sink basin about halfway with water so the plunger cup has liquid to work with. If you have a double sink, block off the overflow hole or second drain with a wet rag so the plunger builds pressure in one chamber. Position the plunger cup directly over the drain opening, making sure it covers the hole completely.
2. Build the Pressure. Push down hard and pull up quickly, repeating this motion 15–20 times without breaking the seal. You're creating suction and pressure to dislodge the clog. After several strokes, lift the plunger away and see if water drains. Repeat the cycle if needed.
3. Test the Drain. Remove the plunger and let the sink drain on its own. If water drains steadily, the clog is cleared. If it's still slow or backing up, the plunger didn't reach it. Move to the next method.
4. Expose the Trap. Place a bucket under the trap (the curved pipe under the sink) to catch water. Using an adjustable wrench or pipe wrench, loosen the nuts on both ends of the trap. Unscrew by hand once they're loose enough. Remove the trap carefully and empty any trapped water and debris into the bucket. You're now looking at the main drain line coming from the wall and the line coming down from the sink.
5. Purge the Blockage. Use your hand, a straightened coat hanger, or a small wire brush to pull out any visible debris, grease, or hair clumped inside the trap. Rinse the trap under running water and scrub the interior with a brush if it's foul-smelling. Wipe it clean.
6. Break the Deep Clog. With the trap still removed, feed a drain snake (or auger) into the opening in the wall where the main drain line goes. Push the snake in gently and turn the handle clockwise if your snake has one. Feed 2–3 feet of cable into the line, then stop and twist. You're breaking up or hooking the clog. Retract the snake, remove any debris caught on it, and repeat until you feel no more resistance.
7. Clear the Stub Line. Insert the snake into the vertical pipe coming down from the sink (before it meets the trap). This smaller line can hold soap buildup and hair. Push the snake up into the sink strainer area if it doesn't come down easily.
8. Flush the Remnants. Fill a large pot with boiling water. With the trap still removed, carefully pour the hot water down both the main drain line and the sink drain stub to flush loose debris. Be cautious of steam and splashing.
9. Reattach and Seal. Align the trap back under the sink so that the inlet (from the sink) and outlet (to the wall) are positioned correctly. Hand-tighten the nuts first, then use your wrench to snug them. Don't over-tighten—just firm enough that they won't leak. Turn on the water and check for leaks at both connection points.
10. Confirm Full Flow. Run water at full flow into the sink for 30 seconds. If it drains quickly and smoothly, the clog is cleared. If it slows or backs up, you may have missed a deeper blockage—repeat the snaking step or call a professional.
11. Deploy the Chemical. If snaking and trap removal didn't work, a commercial drain opener can dissolve stubborn grease or soap. Follow the product instructions exactly—pour the recommended amount down the drain, let it sit for the specified time (usually 15–30 minutes), then flush with hot water. Never mix different drain cleaners; toxic fumes can result. Wear gloves and eye protection.
12. Lock Out Future Clogs. Install a drain strainer basket in the sink to catch food particles before they enter the drain. After dishes, wipe excess grease off plates into the trash rather than rinsing it down the sink. Once a month, pour boiling water down the drain and follow with a cup of baking soda, then a cup of white vinegar (it will fizz); let it sit for 15 minutes, then flush with hot water.