Grey reducing shampoo for grey facial hair Instructions Before you start, please open the enclosed leaflet and read the skin allergy instructions as well as the safety instructions, performing the skin allergy test 48 hours before using. Wet your beard and apply the product using the palms of your hands, not the tips, to avoid leaving any temporary nail stains. Let the product sit for 2-3 minutes before rinsing out thoroughly. After rinsing, wash your hands thoroughly to remove any leftover product. Also make sure to rinse off any surfaces that have come in contact with the product. Use Control GX regularly to maintain your look.