So I gave the rusty part a second dose of Evapo-Rust. I personally think it should have been marketed as a cleaner rather than a rust remover. It cleans up parts and brings out any existing paint without harming it. But it is very superficial at removing rust. I think you would need like a vat full of Evapo-Rust and soak parts in it for a very long period of time if you wanted it to remove rust. And with vinegar being far cheaper per gallon, why not just use vinegar?
