If your microwave oven is covered in splatters the easiest way to clean up this mess is by filling a microwave-safe bowl with water and 3 tablespoons of lemon juice. Microwave on high heat 2-3 minutes until a steam forms. The steam will loosen any hard bits of food, while the citric acids break down any grease. Now you can wipe down all the grime with paper towels. Your kitchen will smell lemony fresh too!