Ever wonder what to do with a lemon after you squeeze it for its juice? Before tossing it into the compost pile, use it to give your fresh produce like apples and pears a good cleaning. Simply rub the halved lemon vigorously over thin-skinned fruit to help break down dirt, impurities, waxes and other residue. The natural acidic nature of lemon will also help disinfect the fruit. Rinse, dry and enjoy.