Bi-O-Kleen Bac-Out Stain and Odor eliminator now comes in a 32-oz. foaming action spray bottle. Bac-Out’s live enzyme culture destroys stains and odors naturally and is safe and effective for pets, laundry, cloth diapers, drains, tiles and more, according to company executives. Bac-Out is also available in 16- and 32-oz. squirt bottles and one- and five-gallon jugs.