How to Unclog a Kitchen Sink Drain

Kitchen sink clogs are one of those problems that stops you cold in the middle of meal prep or cleanup. Water backs up, the smell starts, and suddenly you're staring at a sink full of dirty water wondering if you've got a bigger problem. The good news: the vast majority of kitchen clogs live in the trap or the first few feet of drainpipe, which means you can clear them yourself with basic tools and about an hour of your time. The key is knowing which method matches your clog. A clog from food scraps behaves differently than one from grease buildup, and what works for a slow drain won't work for a complete stoppage. This guide walks you through the progression from gentlest to most aggressive—start at the top, move down only if the previous step doesn't work, and you'll save yourself money and the frustration of an unnecessary service call.

1. Start with What You Can See. Remove the sink strainer basket and inspect it for visible debris—hair, food particles, soap scum. Pull out whatever you can reach by hand. While you're there, check the overflow hole on the sink rim (usually near the faucet base). If it's clogged with debris, clear that too, then reinstall the strainer basket.
2. Heat Breaks the Blockage. Fill a kettle with water and bring it to a rolling boil. If you have a double sink and the other side is clear, seal it with a wet cloth first. Pour the boiling water slowly down the clogged drain in a steady stream. Wait 5 minutes, then run hot tap water to see if the blockage has loosened. This breaks up grease clogs and flushes loose debris.
3. Pressure Does the Work. Fill the sink with enough water to cover the plunger cup by an inch. If you have a double sink, block the overflow hole and the drain of the empty basin with a wet cloth—you need pressure to build. Place the plunger over the clogged drain and push down and pull up vigorously for 20 seconds, maintaining suction. Remove the plunger and check if water drains. Repeat three times if needed.
4. Science Clears the Gunk. Remove standing water if present. Pour one cup of baking soda down the drain, followed immediately by one cup of white vinegar. Cover the drain opening with a cloth or stopper—the reaction will foam violently, and you need that pressure in the pipe. Let it sit for 30 minutes. Boil more water and flush the drain with it.
5. Reach Deep Into the Pipe. Remove the sink strainer. Feed a drain snake (or auger) into the opening, cranking the handle as you push it forward. You'll feel resistance when you hit the clog—keep cranking to break through or snag the debris. Once you've engaged the clog, pull the snake out slowly, which will extract the blockage. Flush with hot water to clear remaining debris.
6. Open Up the Trap. If the snake doesn't clear it, the clog is likely in the P-trap itself. Place a bucket under the curved pipe beneath the sink. Use an adjustable wrench to loosen the slip nuts on both ends of the trap. Unscrew by hand and lift out the trap. Empty any debris or standing water into the bucket, then use a straightened wire coat hanger or flashlight to peer inside and clear any remaining obstruction. Reinstall the trap, hand-tighten the slip nuts, then snug with the wrench.
7. Confirm the Flow. Once the trap is clean and reinstalled, run water slowly into the sink while you watch for leaks under the cabinet. If water drips from the slip nuts, tighten them another small amount. Run the garbage disposal (if you have one) and flush hot water down the drain to confirm full drainage.