CERTAIN PLATES
Do you have a lot of fancy China or metallic-trimmed bowls? Keep them far from the microwave. Even if the metallic trimming is miniscule, it may still react in the microwave, according to the USDA. If you use the microwave a lot, it’s best to invest in a plain colored glass plate for microwave use only.
TRAVEL MUGS
Stainless steel mugs block the heat from warming your coffee or tea and can damage your microwave instead. If it’s plastic, check the bottom of the mug to see if it’s marked as microwave safe—but even if it is, you may want to reconsider.