Keep closets and other storage areas free of all clutter and trash; Make sure that all dishes are clean and safely stored when not in use. Maintain the refrigerator of the unit clean and free of spoiled food. Defrost the freezer when necessary. Keep the bathroom exhaust fan --if any-- free of dust and particles. Maintain a clean toilet and tank, and keep the tub and/or shower clean and free of mildew and mold.