Biz Stain Fighter. A trusted stain remover for over 40 years. The new Stain Trapper formula goes beyond normal cleaning to solve a frustrating problem: "The Surprise Stain" Often the stain breaks apart in solution and re-deposits onto fabrics as very small globules which, over successive washes, causes a visible dingy build-up and general fading. The Stain Trapper formula solves these issues with a new proprietary enzyme blend that allows surfactants to sequester stains more effectively in solution. The net result: Stains go down the drain – not back on your clothes.