Cotton fabric is unaffected by chlorine bleach. However, repeated chlorine bleach launderings will destroy the flame-resistant finish. Chlorine bleach must not be used on durable flame retardant treated cotton fabrics. Detergents containing bleach alternatives (sodium perborate) are acceptable for home laundering. Industrial laundry detergents containing hydrogen peroxide must not be used. Effect of Mildew, Aging, Sunlight and Abrasion Cotton has relatively poor resistance to mildew, aging, and sunlight. Nylon in the blend improves abrasion resistance. Direct exposure to ultraviolet rays in welding causes actinic degradation resulting in fabric strength and color loss.