How to Clean a Kitchen Sink Drain

Gunk is the inevitable byproduct of a hard-working kitchen sink. Over time, a mix of food particles, grease, and soap scum clings to the walls of your drain pipe, creating a breeding ground for bacteria and that unmistakable, sour odor. If your sink is draining sluggishly or smells like a compost heap, it is time for a deep clean that goes beyond just scrubbing the basin. Done well, a drain cleaning restores flow and removes the bio-film that causes persistent smells. You do not need harsh, caustic chemicals to accomplish this; in fact, avoid them, as they can damage older pipes and seals. A methodical approach using mechanical removal and simple, reactive chemistry will get your plumbing running like new without compromising the integrity of your fixtures.

  1. Scrape Away Hidden Gunk. Remove the sink strainer or stopper and physically scrape away any accumulated food waste, hair, or slime with a stiff nylon brush. Wipe the rim of the drain opening thoroughly to remove the black film that usually hides underneath the hardware.
  2. Pour Baking Soda Deep. Pour one cup of baking soda directly into the drain opening. Use a dry funnel if the opening is narrow to ensure the powder goes deep into the pipe rather than sitting on the rim.
  3. Trigger the Chemical Reaction. Pour one cup of white vinegar down the drain on top of the baking soda. The mixture will immediately foam and fizz; quickly place a drain stopper or a wet rag over the opening to force that pressure downward into the trap.
  4. Let Chemistry Do the Work. Leave the mixture to sit undisturbed for at least 30 minutes. This allows the chemical reaction to break down the fatty acids and organic buildup clinging to the pipe walls.
  5. Blast Away Loosened Debris. Boil a full kettle of water and pour it slowly down the drain in two or three stages. The high temperature melts away loosened grease while the volume of water clears the debris through the line.
  6. Restore the Shine. Reinstall the strainer and rinse the entire sink basin with warm, soapy water. Dry the stainless steel with a microfiber cloth to prevent water spots and restore the shine.