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Try soaking it in coca-cola!
Oxidation of the steel of a gun barrel.
Knights would clean their chain mail armor in a barrel filled with sand and vinegar. The sand would help scrub off dirt and grime, while the vinegar would help remove rust and disinfect the armor.
It will rust eventually.
you don't clean it in the bathtub, that will cause it to rust
A very mild acidic cleaner <><><> For light rust, soak in penetrating oil (I like KROIL, but PB Blaster is good also) overnight. Rub with clean coarse cloth, such as burlap. Deeper rust may require stronger methods. Try a copper pot scrubber, such as a Chore Boy pad, toether with the oil. INSIDE the barrel, use a good bore cleaner, and a bronze bore brush.
lemonjuice and salt.
You can clean your penny board using penetrating oil to prevent rust buildup
It doesn't rust but it after about a day you will see that the nail has polished and is completely clean
clean, no pits or rust.
Hydrofluoric acid
Use a wire brush.