If it's still under warranty take it in to the delear and have it fixed, including having the rusted part replaced or fixed. If its out of warranty, remove the step, sand down the rusted area, paint with rustolem or the like and then reinstall the step.
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 Black Sheep Hummer Squadron( CenCal Chapter - Me, Myself, and I )
"OBAMA......Making Jimmy Carter LOOK GOOD!"
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