Re: Rust removal from steel component on the cheap.
My 'go to' substance is Oxalic acid, pretty easily available (if in doubt go to eBay). Dissolves easily. Removes rust stains from fabrics too.
It's poisonous (it's what makes rhubarb leaves poisonous) but not violently so. So just take sensible precautions, don't store in an unlabelled jar next to the sugar jar, etc.
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