E3 Brightening Shampoo NON STAINING FORMULA for Brighter Mains, Tails & Coats. Palomino, Paints, Grays and other Fancy Colors will look better than ever. E3 Brightening Shampoo is loaded with optical brighteners that give your horse brighter whites, shiny highlights and silvery, sparkling grays. Our unique formula works to neutralize yellowing and enhance highlights. Fortified with Nano Multi-Vitamins A,C, E & F for superior absorption and penetration to the main, tail and coat.