Got a funky microwave? Don’t worry, it won’t take long to fix. Simply add 1/4 cup of white vinegar to two cups water in a microwave safe container and zap on high for 3 minutes. Carefully remove the container from the microwave and wipe with either a rag or papertowels. The steam will have loosened all the cooked on bits and a little elbow grease should take care of the rest. If a lot of crud has accumlated since your last cleaning effort, you may have to repeat the process.
Prevent future messes by covering food while it cooks.