You can use Angry Mama Microwave Cleaner to clean your microwave and/or oven.
Angry Mama Microwave Cleaner
Material: Rubber Weight: 140g
Easy steps: Step 1: Remove the top of Mama's hair by twisting counter-clockwise. Pour vinegar and water till each of the respective markings. Replace the top and twist to lock in place Step 2: Microwave for 5 - 8 minutes on a high setting. After about 2 minutes steam will start to blast out Step 3: Remove the Mama by the elbows Step 4: Just wipe down the microwave with a sponge, napkin or rag, and voila a spotless clean microwave