I put this post in a few days ago, but can't find it nor was it answered, so, I must have done something wrong. I am looking for advice on how to clean the frame around the radiator on my 2010 F150 Platinum. It is silver ingot and looks the same as the the rest of the body, but when I put wax on it, it makes these dark smudges. There must be something the rest of you are doing for this. Your help would be appreciated.

Clipper