Short answer
Put 1 cup of water and a few lemon slices or 1 to 2 tablespoons of white vinegar in a microwave-safe glass bowl, heat it until it steams, then leave the door shut for 5 minutes before wiping. Add the lemon or vinegar before heating and don't overheat plain water, since the FDA warns superheated water can erupt and scald.
The microwave is the appliance everybody uses and nobody wants to clean. Splattered sauce on the ceiling, a crusty ring on the turntable, last week's popcorn smell. Steam does most of the hard work for you here. A bowl of water, a lemon or a splash of vinegar, and about fifteen minutes.
Use these at your own risk, and test a small hidden spot first. The steam trick is simple, but hot water in a microwave deserves real respect, so please read the safety part before you start.
Why steam works
Dried-on food sticks because the moisture cooked out of it. Steam puts the moisture back. After a few minutes in a steamy box, splatters soften and wipe off with a sponge instead of a fingernail. Lemon or vinegar adds a little acid and a cleaner smell, but the steam is what does the heavy lifting.
Step by step
- Fill a bowl. Use a glass or ceramic bowl marked microwave-safe. Add about 1 cup of water.
- Add the lemon or vinegar now. A few lemon slices or 1 to 2 tablespoons of white vinegar. Adding them before heating matters, and the next section explains why.
- Heat in short bursts. Run it on high for a minute or two at a time until the window fogs and the walls look wet. Don't let it boil hard or boil dry.
- Wait. Leave the door shut for about 5 minutes. The steam keeps working, and the water calms down.
- Lift it out carefully. Put on oven mitts, stand back a little and move the bowl slowly.
- Wash the turntable. Take it out and wash it in warm, soapy water. Check your manual before putting it in the dishwasher.
- Wipe it all down. Ceiling first, then walls, then the floor of the microwave, then the inside of the door. A damp sponge with a drop of dish soap handles most of it. Dry with a clean cloth.
For anything still stuck, dip a sponge in the warm lemon water and hold it on the spot for a minute. Skip steel wool and harsh scrub pads on the inside, which can scratch the coating.
The safety part, superheated water
The FDA has received reports of serious burns from hot water erupting out of a cup after it was overheated in a microwave. Here's how that happens, in the FDA's terms. Water heated by itself in a clean container can get hotter than its boiling point without looking like it's boiling. Then a small bump, like picking up the cup, makes it erupt all at once.
The FDA says adding a substance to the water before heating greatly reduces the risk. That's one reason we add the lemon or vinegar first. The FDA also says not to go past the heating times in your microwave's instruction manual.
A few more rules we follow:
- Use a bowl that's clearly marked microwave-safe. The FDA notes that some plastic containers shouldn't be used because they can melt.
- Never run the microwave empty, and don't let the bowl boil dry. The FDA says some ovens shouldn't be operated empty, and your manual will say if yours is one of them.
- Keep kids out of the way while the bowl is hot.
- If someone gets burned, get medical care for anything more than a small, minor burn.
Over-the-range microwaves
If your microwave hangs over the stove, it probably has a grease filter on the bottom that catches cooking smoke. Those get sticky fast in a kitchen that fries a lot. Your manual will show how to pop it out. Many can be soaked in hot, soapy water, rinsed and dried. Follow what your model's manual says.
Wipe the outside and the control panel with a barely damp cloth. Don't spray liquid straight onto the keypad, since it can seep behind the buttons.
Keeping it clean longer
The American Cleaning Institute's tip is to clean microwave spills when they happen, because they haven't baked on yet and wipe right up. Covering food with a microwave-safe lid or a paper towel stops most splatter in the first place. A quick wipe once a week keeps you from needing the steam trick very often.
Never mix these
Some people follow the steam clean with a store spray. That's fine, as long as you use one product at a time and rinse in between.
- Bleach and ammonia make chloramine gas.
- Bleach and vinegar, or any acid, make chlorine gas. Poison Control says it burns the eyes, nose and throat and can injure the lungs.
- Hydrogen peroxide and vinegar in the same bottle form peracetic acid, which the Missouri Poison Center calls corrosive.
Never spray bleach cleaner inside a microwave that still has vinegar steam or residue in it. Wipe it out with plain water first. Keep cleaners in their original, labeled containers and out of reach of kids and pets, as the American Cleaning Institute recommends. If anyone swallows a cleaner or gets it in their eyes, call Poison Help at 1-800-222-1222.
Recipe card
Steam-Clean Your Microwave with Lemon or Vinegar
You need
- 1 cup water
- A few lemon slices, or 1 to 2 tablespoons white vinegar
- A microwave-safe glass or ceramic bowl
- Oven mitts, a sponge, dish soap and a microfiber cloth
Steps
- Put the water in the bowl and add the lemon slices or vinegar before you heat it.
- Heat on high for a few minutes, in short bursts, until the inside of the microwave is steamy. Stop before the bowl boils hard.
- Leave the door closed about 5 minutes so the steam can soften the mess and the water can settle.
- Open the door, stand back from the bowl and lift it out slowly with oven mitts.
- Take out the turntable and wash it in warm soapy water.
- Wipe the ceiling, walls, floor and door with a damp sponge, then dry with a clean cloth.
Cautions
- Use at your own risk. Test a small hidden spot first.
- Superheated water can erupt and scald. Add the lemon or vinegar before heating and don't overheat.
- Use glass or ceramic marked microwave-safe. Some plastics can melt.
- Don't let the bowl boil dry, and don't run the microwave empty.
- Never mix bleach with ammonia. It makes toxic chloramine gas.
- Never mix bleach with vinegar or other acids. It makes chlorine gas.
- Don't put hydrogen peroxide and vinegar in the same bottle. They form corrosive peracetic acid.
- Keep kids away from the hot bowl. For burns or a cleaner in the eyes, call Poison Help at 1-800-222-1222 or 911.
Test a small spot first
Try any cleaner on a hidden spot and wait before you do the whole surface. Never mix bleach with ammonia, vinegar or other cleaners. Open a window or run a fan, label homemade bottles, and keep them away from kids and pets. Keep vinegar and other acids off natural stone. Follow the product label. You use these tips at your own risk.
Common questions
How do I clean a microwave with lemon?
Put a cup of water and a few lemon slices in a microwave-safe bowl, heat it until it steams, leave the door shut for about 5 minutes, then wipe the inside with a damp sponge. Wash the turntable separately.
Is vinegar or lemon better for cleaning a microwave?
Both work the same basic way. The steam does most of the loosening. Lemon smells nicer, and vinegar is cheaper. Use whichever you have.
Can water explode in the microwave?
It can. The FDA warns that water heated alone in a clean cup can become superheated and erupt when it's moved. Adding something to the water before heating, and not going past the heating times in your manual, greatly lowers the risk.
How do I keep my microwave from getting so dirty?
Cover food while it heats and wipe up spills right away. The American Cleaning Institute points out that fresh spills haven't baked on yet, so they wipe right up.
Rather have someone else do it?
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Sources
- Microwave Ovens (U.S. FDA, updated Oct 12, 2023) (accessed Oct 8, 2026)
- Room by Room Cleaning Guide (American Cleaning Institute) (accessed Oct 8, 2026)
- Cleaning Product Safety (American Cleaning Institute) (accessed Oct 8, 2026)
- Chlorine gas, what happens if you mix bleach and other cleaners (Poison Control, National Capital Poison Center) (accessed Oct 8, 2026)
- Some Things Just Don't Mix (Missouri Poison Center, updated Jul 7, 2025) (accessed Oct 8, 2026)