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Eh hem:
Chemistry Lesson (somewhat abreviated): Rust requires an electrolyte (salt), metal, oxygen and water. Eliminate any one of them and you get little or no rust.
If you clean the rusted area then seal it so that there is no oxygen, water or electrolyte contact with the metal... no rust. Good ol fish oil will do it internally on doors etc but outside is treat and seal territory. Hope this helps.
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