super old thread but thought I'd also chime in for anyone like me trying for the first time to figure out how to get rid of rail dust.

i work near a train track and I've been super frustrated dealing with a crappy rail dust issue on my new-to-me 2016 white 4R and was getting really discouraged with the general 2-4hr claybar treatment process. I never saw rail dust on my black jeep but its shows up on the white 4R big time. Everything I saw was basically about committing to a 2-4hr clay bar treatment process which i was getting really discouraged about ... but while researching I noticed that Adams Polishes came out with a spray on Iron Removal product just a few weeks ago (April 2018) that is made exactly to combat the rail dust issue for those of us that live or work in a more industrial area. Im gonna buy a bottle and try it out... probably will have to follow up with their clay bar and/or clay glove as well if the spray doesnt get most of it off.

here's Adam's demo video of the Iron Removal spray

i have no affiliation with Adams, im not sponsored by them or anything, its a coincidence my post is coming right on the heels of their new product release.