ClenAir Original Odor Neutralizers are unique odor neutralizers, not perfumes or cover-ups. They eliminate unpleasant odors from the air, neutralizing those caused by smoke, mold, mildew, cat litter and pets, as well as the noxious smells created by formaldehyde hydrogen sulfide and other chemicals. ClenAir Odor Neutralizers are used by hospitals, nursing homes, hotels and many other businesses. They can be used in homes, basements, locker rooms, cars, boats, and any other space that needs refreshing, and come in a variety of sizes. Use one to two pounds of ClenAir Odor Neutralizer for every 400 square feet.