The easiest way to clean a microwave oven is to place a small bowl of water (in a microwave safe bowl) inside the Microwave and run the Microwave on High for 3-5 minutes (be careful removing the bowl or cup it will be HOT). The steam from the water will soften the grime and hardened food. Use a sponge to wipe the oven’s interior use the rough side of the sponge to scrub any still caked on food. To deodorize, combine 1 cup of water with ½ cup of lemon juice in a measuring cup or bowl and heat it on high for 3–5 minutes. Let it stand in the microwave for 5–10 minutes before removing.