1 microwave-safe bowl
1 cup of water
2 tablespoons of white vinegar
1 lemon or lemon juice (optional, for a fresh scent)
A clean cloth or sponge
Step-by-Step Guide:

Prepare Your Cleaning Solution: In a microwave-safe bowl, mix 1 cup of water with 2 tablespoons of white vinegar. If you want to add a pleasant scent and extra cleaning power, you can also squeeze in the juice of a lemon or add a few tablespoons of lemon juice to the mixture. You can even throw in the lemon halves after squeezing them for an added burst of citrus freshness.
Heat the Solution: Place the bowl in the microwave and set it on high for about 5 minutes. The idea is to bring the mixture to a boil, which will create steam. Depending on the power of your microwave, you might need to adjust the time slightly. The steam will fill the microwave, condensing on the walls, ceiling, and even the door, softening the grease and food stains.
Let It Sit: Once the microwave stops, don’t open the door immediately. Let the bowl sit inside for another 5 minutes. This step is crucial as it allows the steam to do its magic, breaking down the grease and grime. The longer you let the steam sit, the more effective this method will be at loosening the tough stains.