Best to remove all foods before starting cleaning. Take out drawers and shelves and allow them soak in hot soapy water, then wipe all surfaces clean with hot soapy water or disinfectant wipes. For thicker tougher stains, mix a small amount of baking soda with a little bit of warm water to make a paste. Apply the paste to the stain and leave for an hour before wipring away with a sponge. Wipe over with a clean damp cloth and allow to dry. This regular self maintenance will also help keep smells from developing.