Clean the interior twice a year. No need to unplug the refrigerator—that will waste energy. But do move the food to a cooler. Wipe the walls and the shelves using a cloth and a mix of dish soap and water, says Varun Rajasekaran, an engineering manager at Kenmore refrigeration. Rinse and dry thoroughly. To clean the door seal, wrap a credit card in a cloth, dip it in soapy water, and glide it into the grooves. Nix odors with a box of baking soda.