How to Deep Clean a Garbage Disposal

Garbage disposals are the workhorses of the kitchen, yet they are rarely afforded the maintenance they deserve. Because they sit out of sight, we tend to forget that food particles, grease, and grime accumulate on the underside of the rubber splash guard and along the walls of the disposal chamber. Left unchecked, this buildup becomes a breeding ground for bacteria and the source of that sour, persistent smell that seems to linger near your sink. Deep cleaning a disposal is not about harsh chemicals; it is about physical agitation and natural deodorizing. Done well, the process leaves the internal walls clear of debris and the kitchen smelling fresh. This project takes very little time but significantly extends the life of your unit while keeping your kitchen environment sanitary.

  1. Kill Power First. Unplug the disposal unit from under the sink or flip the circuit breaker off. Never reach into the disposal or scrub the splash guard with the unit connected to power.
  2. Attack the Hidden Slime. Pull the rubber splash guard flaps upward to expose the underside. Use a stiff-bristled scrub brush or an old toothbrush dipped in a mixture of baking soda and vinegar to scrub away the black, slimy buildup.
  3. Load the Abrasive Mix. Fill the disposal chamber with two cups of ice cubes followed by a half-cup of coarse rock salt. The ice hardens the food particles, while the salt acts as an abrasive to scour the walls of the unit.
  4. Grind Until Silent. Restore power to the disposal, turn on the cold water, and flip the switch. Run the disposal until the sound of the grinding ice ceases, which indicates the chamber is clear.
  5. Freshen with Citrus. Drop a handful of lemon or orange peels into the disposal while it is running. The natural oils and citric acid will neutralize any remaining odors and leave a clean scent.
  6. Flush Deep with Fizz. Finish by pouring a half-cup of baking soda followed by a half-cup of vinegar into the drain. Let the mixture fizz for a few minutes, then flush it through with a full kettle of boiling water.