Between pets and mold, you're going crazy trying to keep the smells at bay. Meanwhile, your head's pounding from all the spray chemicals. Go natural. Lemon's a great deodorizer. Place a few slices on a dish: the citrus scent will fill up any room. For a whole-house treat, simmer oranges in a pot of water. Put a couple drops of vanilla on a light bulb and turn it on; it'll cover up any rank odor.