To kill allergens on furniture, try a specialty fabric spray. Febreze now makes both allergen-reducing and antimicrobial formulas that are safe to use on most upholstery (except leather).
For clothing, take care of dirty, wet items right away—don’t give mildew a chance to develop. If it does, take it to a dry cleaner to be cleaned. Washing and drying at home can set mildew stains.