How to Deodorize a Microwave: Remove Lingering Smells

Why microwaves hold onto odors

Microwave ovens heat food quickly and efficiently because the electromagnetic waves excite water molecules in the food. That speed is convenient, but it also means soups, sauces, and other moist dishes can splatter and steam onto the interior before you have a chance to cover them. The residue collects on the walls, door, turntable, and vents, and once it dries or bakes on, it can keep releasing odor every time the oven warms up.

The good news is that most microwave odors are on the surface, not inside the appliance. That means a combination of cleaning, steaming, and absorption is usually enough to remove them.

Clean the interior before deodorizing

Deodorizing works best on a clean microwave. The FDA's safe food handling guidance recommends washing cutting boards, dishes, utensils, and counter tops with hot soapy water after preparing each food item. Use the same approach inside the microwave: wipe down the walls, ceiling, floor, and door with hot soapy water or a mild kitchen cleaner.

Do not forget the removable parts. The turntable and roller ring can trap food residue and odor, so wash them in the sink with hot soapy water. For a step-by-step routine, see how to clean a microwave interior and how to clean microwave turntable and ring.

If your microwave has a steam-clean function, you can run it with just water before wiping; the steam helps loosen dried-on food. See microwave steam clean for how that setting works.

Steam methods for loosening odors

Steam is one of the easiest ways to attack lingering smells. Put a microwave-safe bowl of water inside, add lemon slices or a splash of white vinegar, and heat the bowl until the water is steaming and the interior is fogged with moisture. Let the steam sit for a few minutes, then carefully remove the bowl and wipe the interior with a clean cloth or sponge.

Lemon adds a fresh citrus scent, while vinegar is a stronger odor fighter. Either works. Use oven mitts or a dry towel when handling the bowl, because the water and the bowl will be hot after heating.

Absorbent methods for stubborn smells

For odors that steam alone cannot remove, an absorbent can pull smells out of the air and out of the interior. Baking soda is the classic choice: put an open bowl of baking soda inside the closed microwave and leave it for several hours or overnight. Afterward, wipe away any powder that settled on the surfaces.

Coffee grounds work in a similar way and leave a mild coffee aroma behind. You can also make a thick paste from baking soda and water, spread it on the worst spots, let it sit, and then rinse it off with a damp cloth. Be gentle if the interior has a coated finish; see microwave interior liner materials to learn which cleaning approach suits your model.

Deodorizing after fish, popcorn, or smoke

Fish, popcorn, and burnt food leave some of the strongest microwave odors. Start with the steam method to loosen residue, then use an absorbent method overnight for anything that remains.

Smoke odor can be harder to remove because it can settle in the vent openings and exhaust grille. If your microwave has a vent, clean the grille and the filter area according to your model's manual. For over-the-range models, see over the range microwave filters and how to clean a microwave vent grille.

Prevent odors from coming back

The best way to keep a microwave fresh is to stop spills before they bake on. Cover food with a microwave-safe lid or splatter cover when reheating, and follow the FDA's advice to cover, stir, and rotate food for even cooking in a microwave. Allow standing time after cooking because it lets the heat finish the job evenly.

Clean small spills as soon as the interior is cool enough to touch. Leaving the door open for a few minutes after cooking lets steam escape instead of condensing on the walls. Also wipe the door and control panel on a regular basis; see how to clean a microwave door and how to clean microwave control panel.

When a smell signals a problem

A food smell is normal. A burning, electrical, or ozone smell is not. If you notice smoke from the vents, sparking, or a persistent burning odor, stop using the microwave and unplug it. These can be signs of an electrical problem inside the microwave.

See microwave burning smell, microwave smoke from vents, and microwave smells like ozone for troubleshooting steps. If the microwave cannot be repaired and you replace it, recycle the old unit through an electronics recycling program.

What to pick for your use

Questions

How long should I leave baking soda in the microwave?

For stubborn odors, leave an open bowl of baking soda in the closed microwave for several hours or overnight. Afterward, wipe away any powder with a damp cloth. If the smell is still strong, repeat the process before cleaning again.

Can I use vinegar to deodorize my microwave?

Yes. Mix a few tablespoons of white vinegar into a microwave-safe bowl of water and heat until the interior is foggy with steam. Let it sit for a few minutes, then wipe down all surfaces. Vinegar is especially good at cutting grease and neutralizing strong odors.

Is it safe to use lemon juice in the microwave?

Yes, lemon juice or lemon slices in water are safe to heat. The steam carries the lemon scent and helps loosen food residue. Do not heat a dry lemon peel, because it can burn.

Why does my microwave smell like burnt plastic or ozone?

A burnt plastic or ozone smell is not normal. Unplug the microwave and stop using it. These smells can indicate an electrical problem or a damaged component.

Will deodorizing remove the smell of smoke from a microwave?

Steam cleaning and an overnight absorbent treatment usually remove smoke smells that are on interior surfaces. If the smoke smell came from the vent or exhaust system, clean the vent grille and filters. If the smell persists, the odor may have penetrated a component, and you should unplug the appliance and consult a professional.