Ok so this is a HUGE necro bump but I think it's still relevant, plus I have a link to share! So flamesuit on; heeeeere we go!
I have a 2013 PW Z and I have rail dust issues (bloody frustrating if you ask me). Now I know a lot of people have said "clay bar" but I've found this article on a car detailing site that tells you to do otherwise. Can anyone confirm that the methods he's suggesting is not only more effective, but also safe for paint?
Rail dust and its removal
Also has anyone witnessed rail dust come back or etch their paint after clay barring without doing the recommended chemical treatment to their car?