Microwave Filth: Food splatters all over the inside of your microwave and cooks itself on after time. To easily remove this mess, place a sponge soaked in water in the microwave. Cook on high heat for 2 minutes, then allow it to sit without opening the microwave door, for 5 minutes. The filth is now ready to be wiped right off - no scrubbing - and your sponge is right there!