Re: Rust removal from steel component on the cheap.
Most trains used to use cast iron brake blocks and the dust would make a mess of any paintwork. Oxalic acid was used to clean off the iron stains.
I have some milk stone remover which smells of organic (acetic?) acid. I might try this at some stage.
I like the idea of sodium bicarbonate solution (washing soda) with electrolysis. No very nasty chemicals. It did strip some paint off a storage heater when the package was left there for a few days so it now sits on a ceramic dish.
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