Could spray them down with/ wipe them with a thin coat of oil to keep the water away from the metal, thus causing oxidation...just a thought. Or even car wax on them? Not sure if wax would work or not. Hope that helps.
Nick.
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'99 Dodge Ram 2500 Cummins QuadCab, 4 1/2" skyjacker Stage I,315/75/16 TXR's, K&N air filter, smitybilt brushguard with 2- 6X9 KC daylighters, pilot reverse lights, bedliner, front and rear door steps,Cobra CB, Bushwacker fender flares, More to come...