If you have rusted running boards, one labor-intensive option is to remove the bars and sand them until the rust comes off then polish the steel. However, it is still possible that the rust will return. It is especially difficult to stop rusting after it begins. If your brackets are rusted through, you will need to replace the brackets. If you have the make and model of your running boards, I would happy to assist you in finding replacements if you provide that information.
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