This is a proven method to clean the build up on the inside of your microwave oven. In a microwave safe bowl or cup, mix one tablespoon of vinegar and one cup of water along with 1-2 drops of dish soap. Place the mixture into your microwave oven and run for three to four minutes on high. Let the solution stand in the oven for fifteen minutes. The vinegar in the steam solution loosens the buildup like Vinegar Magic. Wipe the inside of the microwave oven with a damp sponge and smile. Heed all of your manufacturer's warnings concerning the care and cleaning of your microwave oven.