A microwave gets dirty fast: soup splatters on the ceiling, sauce dries on the walls, and the smell of last week's fish lingers for days. The fix is steam, not scrubbing. Boiling water inside the microwave fills the cavity with steam, and the steam softens everything stuck to the walls so it wipes off with a cloth. The whole job takes ten minutes, and most of that is waiting.
Fill a microwave-safe bowl with water and add either two lemon halves or two tablespoons of white vinegar. The lemon leaves a fresh smell; the vinegar cuts grease better. Either works — use whichever you have. Do not use a metal bowl, and do not cover the bowl with plastic wrap.
Fill the bowl. Put a microwave-safe bowl with water and lemon halves or vinegar on the turntable. The water should be at least half the bowl so it boils for a full few minutes without running dry.
Microwave for 5 minutes. Run the microwave on high for 5 minutes, until the water is boiling and the window is fogged with steam. Do not open the door during this time — the steam is doing the work.
Let it sit for 2 minutes. Leave the door closed for another 2 minutes after the microwave stops. The steam keeps working on the dried-on food while the bowl cools enough to handle safely.
Wipe the inside. Take the bowl out and wipe the inside with a damp cloth — ceiling and walls first, then the floor. Most splatters come off in one pass. For a stubborn spot, dip the cloth in the hot lemon water and wipe again.
Clean the turntable. Lift the turntable and the roller ring out and wash them with hot soapy water, then dry them and put them back. Food and grease collect under the turntable where you never see them.
Wipe the door, the seal, and the outside. Wipe the inside of the door and the rubber seal, then the outside with soapy water. Do not spray cleaner directly into the vents — spray the cloth instead, and keep liquid out of the vent slots.
For a spot that survived the steam, make a paste of baking soda and water, spread it on the spot, wait ten minutes, and wipe it off. For a smell that survives cleaning, leave a bowl of vinegar water in the microwave overnight with the door closed. Never use steel wool or an abrasive pad inside a microwave: scratches in the cavity can cause arcing, and a scratched door screen is a reason to replace the unit. The same inside-out routine works on other kitchen appliances — the coffee maker descaling guide and the oven calibration guide are the same idea applied to the next two appliances.
Never put metal in the microwave, and never run it empty — both can damage it. Do not use oven cleaner inside a microwave: it is caustic and the residue ends up in the next meal. Do not microwave a sponge to clean it — sponges can melt or catch fire, and a cloth does the same job safely. And unplug the microwave before you clean around the door seal if the plug is easy to reach.
Wipe up a splatter when it happens, and do the full steam clean once a month for a microwave used daily. A microwave that only reheats coffee needs it far less often.
Yes. Two tablespoons of white vinegar in a bowl of water is the standard steam method, and it cuts grease better than lemon. The vinegar smell fades within an hour.
The smell is usually in the turntable, the roller ring, or the door seal — the three places people skip. Wash them all, and leave a bowl of vinegar water inside overnight if the smell persists.
No. Sponges can melt or catch fire in a microwave, and the heat does not reliably kill the bacteria in them. Use a fresh cloth instead, and replace sponges regularly.