How to clear a slow-draining kitchen sink

Drainage issues in the kitchen almost always start with a slow creep toward a total standstill. What begins as a slightly sluggish whirlpool turns into a basin of standing, lukewarm water that defeats the purpose of having a sink in the first place. You don't need professional plumbing tools to reclaim your flow; most kitchen clogs are simple blockages of grease, soap scum, and food particles trapped in the accessible U-shaped pipe beneath the basin. Done well, this project takes less than an hour and saves you the cost of a service call. The key is to avoid harsh chemical drain openers, which can damage older pipes and seals, and instead focus on physical removal of the debris. By the time you are finished, the water should vanish down the drain with that satisfying, quick gurgle of a wide-open pipe.

  1. Access the P-trap safely. Empty the cabinet beneath your sink to provide clear access. Lay down an old towel or a plastic tray to catch any water that spills when you loosen the plumbing connections.
  2. Catch the standing water. Place a bucket directly under the P-trap, the curved pipe section visible beneath the sink. This will catch the stagnant water trapped in the bend once you break the seal.
  3. Disconnect the P-trap. Loosen the slip nuts on both ends of the P-trap by turning them counter-clockwise by hand or with a pair of channel-lock pliers. Carefully remove the pipe and pour the contents into your bucket.
  4. Remove trapped debris. Inspect the pipe for gunk, hair, or food debris and clean it out with a bottle brush or a gloved hand. Check the vertical pipe leading from the sink drain for any debris stuck further up the line.
  5. Reconnect with care. Replace the P-trap and tighten the slip nuts by hand until they are snug. Do not overtighten, as this can crack plastic fittings or strip the threads.
  6. Dissolve residual buildup. Pour a half-cup of baking soda followed by a half-cup of vinegar down the drain, covering it with a stopper for 15 minutes. Finish by flushing with a full kettle of boiling water to clear any lingering grease.