Start with a thorough cleaning. Molds love dark, damp areas and build up in basements, laundry rooms, closets, attics, and bathrooms. Use a weak bleach solution for cleaning and dispose of any items that have mold. Keeping indoor relative humidity below 35 percent with a dehumidifier will help reduce mold build-up. Dust is the next enemy to attack.
Dust mites hide deep in carpets, upholstery, furniture, bedding, clothing, and closets.
Use a damp mop or sponge and dust the house thoroughly while wearing a dust mask. Try to eliminate anything that collects dust like knickknacks, books, and stacks of magazines. Wash and dry bedsheets, blankets, and towels in hot water every 7-10 days. Use dust-proof covers on mattresses and pillows. Avoid scented candles and air fresheners, even during the holidays.