Yes, phosphoric acid. The same stuff in Coca Cola. That’s why coke will remove rust off stuff soaked in it. I sometimes do gun parts in phosphoric acid to give them a French style finish.
When it comes to cleaning, I use mechanics hand cleaner. Best results with pumice and citric additives and old red scour pads or brushes. Doesn't matter; bare metal or paint, it works. And did I say cheap?
Just oil and a scrubber pad for me please
Did you know that a surface polished with oil resists rust better than one polished dry? True, according to the South Bend "how to run a lathe" book
M
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