This is the classic cloth for true brass instruments. The polish is in the cloth, and our tarnish eater ingredients are water-based. There are no harmful agents. Whether you have cymbals or unlacquered brass instruments, this cloth is ready to use out of the pouch. Always make sure that Blitz Cymbal Care is moist. If it dries out, you can add a little water to dampen it, but never wash it because youll remove the special ingredients.