- How to Clean the Inside of Microwaves
Place 1 cup of water and some lemon, lime, or orange slices (squeeze a little juice from the fruit slices into the water) or several tablespoons of white or apple cider vinegar in a microwave-safe bowl and set it inside your appliance. Turn it on high power for several minutes until the mixture boils and the window is steamy. Let it cool for 5 minutes before opening the door, then remove the bowl and wipe the inside clean with a sponge.
https://www.goodhousekeeping.com/home/cleaning/tips/a17694/spring-cleaning-microwave-grime/
