Autojoy Metal X is a complex acid & surfactant blend to remove burnt in particles of rust, rail-dust contaminant and general industrial fall-out from paintwork, glass ,plastic etc. Easy and safe to use on paintwork,glass,rubber,chrome and plastic. Avoid direct sunlight, apply with a sponge or trigger spray do not let the product dry out on the surface rinse with clear water then wash the vehicle with a shampoo to neutralise any remaning solution.Great on wheels and will remove brown rust stains too.