Let your microwave clean itself, well almost. Mix 2 cups of water and 2 teaspoons of white vinegar in a microwave safe bowl and cook for 3-4 minutes depending on the power of your microwave. LET THE MICROWAVE STAND FOR AT LEAST 15 MINUTES! This is very important as the water vinegar mixture will have boiled off and it will be very hot and can easily cause severe burns, so be careful. After the microwave has cooled down take a damp sponge with a small amount of dish soap and wipe out the inside of the microwave, all the baked on stuff should just fall off. Follow up with a clean damp sponge with just water to finish the job.