Originally Posted by Burns098356GX
I'd get the dealer to look at it before you put effort into cleaning it. You might make it worse and the void the warranty.
Sent from my Nexus 7 using FF Mobile
You are not going to damage the car or affect your warranty with a clay bar. Give it a try, it's hard to mess up if you follow the directions on the box. This is classic rail dust, and it won't be covered under warranty.