Fight mold and mildew

Try to reduce moisture in your house, by turning on an exhaust fan while showering and running a dehumidifier in the basement. Replace shower curtains or curtain liners more often, and at least once a year use a tile-and-grout cleaner to clean whatever may be growing on your bathroom walls. Clean your refrigerator regularly, by discarding expired foods and wiping down the shelves and interior walls (do not forget rubber seals along doors).