Thank you for letting me know Sprint - Please do contact Mercedes, they are currently considering mine for a warranty claim but haven't confirmed one way or the other yet. The dealer seemed to think that a very strong acid had been used on the car as the marks are where a liquid has eaten quite deeply into the surface of the finish. I don't think that's true, else it would have marked the bodywork too, which it hasn't, but I think that the anodised finish on the night pack is reactive to traffic film remover, which makes it a terrible idea. If I do get my roof rails replaced, I think I'll pay to have the clear coat lacquered else it could easily happen again.Thanks for posting.PS. You can cover the marks up by rubbing bumper/plastic gel on them. It only lasts a few days but works as a temporary fix.
Edited by: Wiz