KitchenUse a vented exhaust fan over your stove to completely remove cooking fumes from your kitchen. Scrub sinks, faucets, refrigerator trays and door seals to remove mold. Keep under-sink cabinets and countertops clean and dry. Use a disinfecting cleaner to kill mildew. Get a secure trash bin, and empty it regularly to keep insects away. Cockroaches are a common cause of indoor allergy symptoms and asthma — yet another reason to keep them out of the house.