Product for cleaning graves,it's nontoxic. The product other than marble, applies to all metal surfaces and dyes, making it ideal for candles, crosses, vases, censers, generally for the memorial items, accessories, and more. Limpio limits the accretion pollutants while maintaining reducing the damage caused by weather conditions keeping clean and polished the surfaces. Following tests we can assure you of its effectiveness and recommending you to buy it and try it .The product is also suitable for home use