A.

While cheese graters and coffee machines can get pretty gross if you don’t clean them often, your kitchen sink is “basically a liquid trash can,” according chef John Ho, quoted in the magazine. Splashes of food as you are doing the dishes can cling to the sides of your sink and become a breeding ground for bacteria. So wash your sink—daily. Other items that can be massively bacteria-laden: your sponge (likely the dirtiest thing in your kitchen), can openers (nobody cleans them) and your freezer (ditto).