I live in salt country, this past winter has been awful for it will all the ice and snow we have had. I usually wash the truck first chance i get even if its cold out and i hit the usual spots where dirt, salt, and grime have a tendancy to build up and so far no rust on the bumpers at 81000 miles just the rust thats eating my right rear quad door at the bottom seam, but got my por15 and just waiting for warmer weather...