This is perhaps the WORST microwave that I have ever come across. Still, even this mess could be cleaned with ease. I put water and vinegar in a bowl, shut the door, and turned on the power for five minutes. The heat, moisture, and vinegar loosened the food while sanitizing the germs. Then, I took a new kitchen sponge and wiped off the old grime.
Now, the microwave has a complete make over!