Rail dust is the small metallic particles that accumulate on vehicles during transport. It's called rail dust because it's belived a lot of it comes from the trains used to transport vehicles to the various distribution points, but in reality it could come from anywhere, and occur at any time.
The particles stick to the paint, and if not removed, eventually will begin to rust. If you don't stop it before too long, it can ruin the paint permanently.
Claying will remove the particles, and compounding/polishing and rewaxing should remove any discoloration if it's not too deep. Like I said, there are some specialized wash solutions out there that are supposed to neutralize and remove the rust, but I've never used them.
Definitely don't wait though, the longer those things rust, the more it will eat up your paint. If it eats down through the clearcoat into the paint, you're looking at more or less repainting.
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Genthar
Rhino Lining, Waag one piece grille guard and wheel to wheel nerf bars, 3M Xpel on headlights, front corner lights, and foglights, Valentine One radar detector, XM Satellite radio, Navigon 7100 GPS, Lightforce 240 Blitz aux lights, Aux. reverse lights.
AEM Brute force intake, courtesy of AEM Power and TundraSolutions.com
Teamwest Coilovers, Camburg Upper A arms, Daystar Steering Rack Bushings, Total Chaos Diff Drop spacer, JBA Headers, Y-Pipe, and EVOL exhaust.
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