has anyone had problems with rail dust. i have a white 05 tahoe. 3 months after i bought it i noticed little orange spots in the paint. i took it to the dealer and they told me it was rail dust. they cleaned it and it came right back. i have had it cleaned 3 times now. i called GM and they aren't helping at all. of course now its out of warranty. they say it's something i'm doing but i know it's embedded in the clear coat. i just wondered if anyone else had the same problem