How to Clear a Slow Bathroom Sink Drain

Drainage issues in a bathroom sink are rarely caused by a mystery. Nine times out of ten, a slow-draining sink is the result of hair, soap scum, and toothpaste residue coalescing into a stubborn sludge directly inside your pop-up stopper or the P-trap located under the sink. Ignoring this won't fix it; the blockage will only tighten over time until the sink stops draining entirely. Getting this done well means working cleanly and methodically. You aren't just pushing the clog further down the pipe; you are manually extracting the obstruction so the water flows freely again. This is a task that rewards patience and a steady hand, ensuring your plumbing remains clear for the long haul.

1. Free the Stuck Stopper. Look under the sink for the lift rod connection. Loosen the nut on the back of the drainpipe to release the stopper, then pull the stopper out of the drain opening from above.
2. Scrub Away the Gunk. Remove any hair or debris wrapped around the base of the stopper. Scrub it clean with a stiff brush and warm, soapy water to ensure the mechanism moves freely.
3. Catch the Spillage. Place a bucket directly under the P-trap—the U-shaped pipe beneath the sink. This will catch the standing water that is guaranteed to spill out once you loosen the connections.
4. Unlatch the Trap. Use your hands or channel-lock pliers to loosen the two slip nuts holding the P-trap in place. Once loose, slide the trap off and let the water drain into your bucket.
5. Flush Out the Filth. Take the trap to another sink and rinse out the accumulated gunk inside. Use a bottle brush or a piece of wire to dislodge any stubborn debris stuck in the curves of the pipe.
6. Reassemble and Verify. Slide the P-trap back into position and tighten the slip nuts by hand. Reinstall the pop-up stopper, turn on the faucet, and watch for any leaks at the connections.