Dilute COIL BRITE RX  in ratios of 1 : 5 to 1 : 15 in water depending on surfaces to be cleaned COIL BRITE RX can be applied with a brush or sprayer on wet surfaces. Apply from the bottom and work up allowing two to five minutes for penetration of the deposits. Rinse well with water while brushing in order to get a brighter surface. For fiberglass, use 1 : 5 ratio with water, spray or brush onto surface, brush off deposits and rinse.