OxyClean? Don’t judge me.

[Richard Flanders]

OxiClean is an oxidizer and is based on some form of peroxide. If you mix it with water for your cleaning I'd guess it would rust carbon steel. I'd use it maybe to clean a muzzle loader but it would be a fast cleaning. I use Oxiclean on all sorts of stuff and it is truly amazing. I recently used it to remove a 15yr old dark beer stain from a light colored carpet that no other stain remover would touch. It does work incredibly well on cleaning the black residue out of coffee and tea pots; there's nothing better. Basically it will clean anything that can be oxidized so it will work very well on old oil residue.