EcoProTec Rust Stain Remover - 1 LtrHigh performance non acidic non caustic formulation. Removes surface rust stains left by standing metal objects and lawn fertilisers from the surface of paving. Particularly suited for delicate applications such as marble and limestone. Acts directly onto the surface to be treated, removing stains in just 15 minutes. Ideal for porcelain, sandstone, limestone, slate, granite, brick, terracotta, and concrete paving.