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I had a similar problem with a 1996 White Chevy dually that I bought new.
I went around and around with the dealer and the final diagnosis was rail dust. I guess it gets on the steel before it's painted and then works it's way out over time. We clay barred it several times and it was just okay.
I only had the truck for 4 years but it still had a few spots when I sold it.
Good luck! but it will probably never be a show car. Even if you repaint it without stripping it all the way down to bare metal.
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