Using Fiber Rinse leave fibers and fabrics in an acid state after cleaning and will help to prevent browning. Use on carpets, upholstery, urine, road salt, calcium chloride, stabilize dye, browning preventative, rinsing agent. Use to eliminate carpet stains left by ice melting residue, use 1 to 3 ounces per gallon of water in carpet extraction equipment. A color fastness test in a hidden area should always be performed before extraction on carpet and upholstery.