As with all metals, be rust or corrosion, one has to remove it down to the bare metal. If it is just in a few small places, try some nail polish remover on a Q-Tip used sparingly or a Dremmel with a sanding drum on low, then touch it up with the color desired. If it is really bad, removing all the hardware and media blasting is the way to go and re-paint the whole thing.
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