How to Unclog a Bathroom Sink Drain

Drainage issues in a bathroom sink are almost always caused by a buildup of hair, soap scum, and toothpaste residue accumulating in the P-trap. When the water begins to pool and drain slowly, the clog is usually located just beneath the basin, acting as a filter for everything that goes down the pipe. Ignoring a sluggish drain only makes the eventual clearing process messier and more difficult. Performing this task yourself saves a service call and provides a clearer understanding of your home's plumbing layout. Done well, you will have a free-flowing drain without the need for harsh chemicals that can eat away at older pipe materials. Focus on containment and methodical removal, and you will have your sink back in working order within minutes.

1. Clear Your Work Zone. Remove all items from under the vanity cabinet to provide clear access to the plumbing. Place a small bucket or a shallow basin directly under the P-trap to catch residual water.
2. Extract the Trap. Loosen the two slip nuts on either side of the P-trap using channel-lock pliers or by hand if they are plastic. Carefully unscrew the nuts and slide the U-shaped pipe downward to remove it from the drain assembly.
3. Remove the Blockage. Inspect the inside of the removed pipe and the vertical tailpiece for hair or debris. Manually pull out any gunk with a gloved hand or a stiff wire brush.
4. Inspect Seals. Wipe the threads of the pipe and the slip nuts clean with a rag to ensure a tight seal upon reassembly. Check that the rubber washers are still pliable and not cracked.
5. Reattach the Trap. Slide the P-trap back into position, ensuring the slip nuts thread onto the pipes squarely without cross-threading. Tighten the nuts firmly by hand, then add a quarter turn with pliers.
6. Verify No Leaks. Turn on the bathroom faucet and let the water run at full pressure for one minute. Check each connection point under the sink with a dry paper towel to detect any small drips.