Many things can damage the fibers' added acid dye blockers-wear, age, pet damage, and improper cleaning. Contains acid dye blocker replenishments to help repel stains from products like soft drinks, sports drinks, ink, coffee, tea, wine, and urine. Can be used on carpets, area rugs, upholstery, and fine textiles. WoolSafe approved when applied properly. Can be used on delicate fibers such as wool and other natural fibers without the fear of shrinkage or distortion.