Your microwave is one of the most used and abused appliances in your kitchen, so its interior is likely spotted with cooked-on food and liquid. To loosen the mess, combine one cup of water with a splash of vinegar, a couple of drops of vanilla extract and two tablespoons of lemon juice. Heat the mixture for one minute on high. Let the bowl sit for several minutes before opening the door. This allows the aromatic steam to get to work softening the burnt-on residue. Open the door and carefully remove the bowl. Using a damp, clean cloth, wipe out the inside of the microwave.