SAPPHIRE is a specialty formulated blend of acids and non-ionic surfactants designed to remove stubborn stains such as grout smear, red dirt and scale removal from most masonry surfaces and shower screens. Always wear Personal Protective Equipment (PPE) – A minimum requirement of Safety Glasses, Gloves & Boots. Damage to clothing may occur. 1. Mix SAPPHIRE at 50ml per Litre of water in a plastic watering can and apply to stains. Leave for 5 minutes and gently agitate with an ENVIRONEX EAGER BEAVER (Do not let the area dry out). 2. Rinse the area with fresh water. 3. Neutralise the area with a capful of REFRESH pH neutral detergent in 5-10L of water. 4. Rinse with fresh water. Always test first.