Hoppe"s 905 No. 9 Nitro Solvent, Aresol Can Hoppe"s No. 9 remains the widely used remover of powder, lead metal fouling and rust. Hoppe"s 905 No. 9 Nitro Solvent, Aresol Can Features: Formula penetrates deep and rapidly Ultra-potent, safe and easy to use A world wide favorite since 1903