Hardwood floors: A once-a-week treatment picks up dirt that can otherwise get ground in and cause scratches. First dust with a dry mop. Then, if your floors are polyurethaned (most are), slightly dampen a mop with a mixture of 1 cup white vinegar and 1 gallon water and swipe the surface, going with the grain. Shine by buffing with a soft cloth. (Cloth diapers work well.) If your floors are waxed rather than polyurethaned, skip the damp mop (these floors are not watertight) and just vacuum.