Yellow Out Shampoo from Cowboy Magic is designed to neutralise yellow stains and brightens hair of all colours. The Yellow Out shampoo leaves the hair silky, shiny and smelling lovely. Shine in yellow shampoo also leaves white hair brighter and whiter. Can be used on both horses and dogs. Directions: Apply to wet hair, massage in until blue suds turn white. Soak for two to five minutes, then rinse well before repeating, if necessary.