How often should you clean a garbage disposal?

Short answer

A quick clean every week, a deeper clean once a month. The quick clean is a handful of ice and a run of cold water, which scours the grinding chamber. The monthly clean adds baking soda and vinegar to lift the film off the walls, and a few citrus peels to finish. Each takes 5 to 10 minutes and costs $0 to $5 in pantry supplies.

Why it matters

A disposal grinds food against the walls of a small chamber and flushes the bits down the drain. Grinding leaves a smear. Grease from a pan, starch from pasta water, the pulp of whatever went down last: a thin coat of it stays on the chamber walls, on the underside of the splash guard, and on the blades. Bacteria grow in that coat, and the sour smell at the sink is what they produce.

The film builds. It slows the grind, so food sits longer and the smell gets worse. It coats the drain line below the disposal, where it catches more debris until the sink drains slowly or backs up. A clogged disposal line is an unpleasant job, and a jammed motor can burn out. A handful of ice once a week keeps the chamber scoured clean so none of that gets started.

When to do it more often

The schedule has no listed modifiers, since the quick clean is already weekly. What moves the deeper clean forward is the smell. If the sink smells sour before the month is up, do the baking soda and vinegar treatment then. A disposal that handles a big household's dinners every night, or one that gets greasy pans scraped into it, will need the monthly clean closer to every couple of weeks.

What you need

Ice cubes, a good handful
Coarse salt
Baking soda
White vinegar
Citrus peels, from a lemon, lime or orange

Steps at a glance

Run cold water, turn the disposal on, and feed it a handful of ice and a spoonful of coarse salt. Let it grind until the noise smooths out.
For the monthly clean, turn the disposal off and pour baking soda into the chamber, then vinegar, and let it fizz for a while.
Lift the rubber splash guard and scrub its underside with a brush and dish soap, where most of the smell lives.
Rinse with hot water while the disposal runs.
Feed it citrus peels with cold water running to leave the drain smelling clean.

You're done when the disposal runs smoothly and the sink smells like citrus rather than old food.

Signs it's overdue

A sour smell from the sink, strongest when the disposal first runs.
The sink drains slowly, because the line below the disposal is coating over.
Grinding that sounds different, laboring or rattling, which means buildup or something stuck.

DIY or pro

This is an easy job that uses what's already in the kitchen. The ice does the scrubbing, and the only hands-on part is cleaning under the splash guard, which is where the smell hides. There's no service to hire for routine cleaning.

A plumber is for the problems a cleaning doesn't fix: a disposal that hums but won't turn, a leak from underneath, or a drain that stays slow after the ice and vinegar. A disposal that jams can often be freed with the hex key that came with it, turned in the slot on the bottom, after the power is off.

Safety

Electricity: don't put your hand into the chamber while the disposal is plugged in or its breaker is on. If something has to be fished out, switch off the breaker first and use tongs. The ice and vinegar cleaning doesn't need a hand in the chamber.

FAQ

Does ice really clean a garbage disposal?

Yes. The ice is hard enough to scour the film off the chamber walls and blades, and it melts away without any residue.

Why does my garbage disposal smell?

Food residue on the chamber walls and under the splash guard grows bacteria. Scrubbing the guard and running baking soda and vinegar through clears it.

Can I put lemon peels in the disposal?

A few at a time, with the cold water running. They leave a fresh smell. Whole lemons or a pile of peels can jam it.

What shouldn't go down a garbage disposal?

Grease, coffee grounds, fibrous vegetable stalks, pasta and rice, bones, and anything that isn't food. Grease and starch are what coat the chamber and the drain line.