I found this really useful:
- Fill a microwave safe glass or bowl half way with water with a tablespoon of white vinegar and place inside the microwave. Turn on for 5 minutes. The idea here is to steam up the walls of the microwave and loosen the dried-on gunk.
- When it is done, remove the glass container and wipe down the inside of microwave with a clean towel or paper towel.
- The loose gunk should come off easily now, and without chemical cleaners inside the microwave.
- Take out the glass tray or turntable and wash it like a dish. You could even run it through the dishwasher if you have the time.
How to clean a microwave with no chemicals.