Water stains on rims

On my girls car, her front 2 wheels have turned colors due to sprinkler water on her rims... She has a 2008 altima, with the factory wheels... the powercoated silver type.. i think thats what they are. What can I use to take care of this discoloration?

Good thing they aint chromes!!!

hard water satins that sucks We have the same issue in Vegas