How to unclog a kitchen sink

Steps

Goal: Remove the strainer, clear visible debris, and try the simplest fix first.

• Lift or unscrew the strainer basket. Pull out food or debris with needle-nose pliers.
• Run the garbage disposal briefly with cold water if you have one. Run the faucet and check flow.
• Good: Water drains after removing debris. Proceed to Verification.
• Bad: Still blocked—proceed to Try the plunger.

Try the plunger

Goal: Use a cup plunger to clear soft clogs (grease, food) near the opening.

• Plug the other basin if you have a double sink. Fill the clogged basin with enough water to cover the rubber cup.
• Press the plunger down to form a seal and pump firmly 10–15 times. Verify that water drains freely when you lift.
• Good: Water drains freely. Proceed to Verification.
• Bad: No change—try Flush with hot water or Baking soda and vinegar.

Flush with hot water

Goal: Loosen grease buildup.

• Pour very hot tap water into the drain in two or three stages. For PVC pipes, use very hot tap water only—not boiling.
• Good: Standing water swirls and drops. Proceed to Verification.
• Bad: No change—try Baking soda and vinegar or Drain snake.

Baking soda and vinegar

Goal: Break down grease and soap buildup with a safe, non-chemical treatment.

• Pour half a cup of baking soda into the drain, then half a cup of white vinegar. Cover with a wet cloth, wait 15–20 minutes, flush with hot water.
• Good: Water drains at normal speed. Proceed to Verification.
• Bad: Still slow—try the drain snake or Clean the P-trap.

Drain snake

Goal: Reach deeper blockages that the plunger cannot clear.

• Feed a hand-crank drain snake into the drain opening until you feel resistance. Crank clockwise to bore through or hook the clog.
• Pull back slowly. Run water and verify the drain flows at full speed.
• Good: Water drains at full speed. Proceed to Verification.
• Bad: Snake hits a hard stop—see When to get help.

Clean the P-trap

Goal: Clear blockages in the P-trap when the snake does not reach the clog.

• Place a bucket under the P-trap. Unscrew the slip nuts and remove the trap. Dump contents, look through to confirm pipes are clear.
• Reassemble finger-tight, snug a quarter turn with pliers. Run water and verify the drain flows.
• Good: Water drains; no drips at the slip nuts. Proceed to Verification.
• Bad: Water still pools—see When to get help.

When to get help

Call a plumber if:

• The snake hits a hard stop that will not budge (could be a pipe fitting or main-line blockage).
• Water backs up from multiple fixtures (suggests main-line blockage).
• You smell sewage (possible main-line or vent issue).

Verification

• Run water at full volume for 60 seconds. Water should drain without pooling.
• Check for drips at the P-trap connections.
• Repeat the flow test after 24 hours to confirm the clog has not reformed.