Contains optical brighteners, revives whites and colored fabrics, actually restoring their appearance. These brighteners are not destroyed by hot drying and ironing. The special quaternary ammonium softening ingredients stay with the fabric during extraction rather than going down the drain. These cationic agents attach themselves securely to all fibers. Unlike many softeners, Zone Defense is completely removed with each wash. It cannot build up and dull fabric. Specially formulated to help avoid ironer scorch.