Originally Posted by Upstater
Chances are what you're seeing isn't rust but "rail dust", or tiny pieces of metallic dirt that stick to the paint; my truck is white and I find it all the time.
Clean the truck good then claybar the tailgate and I'd be willing to bet the "rust" spots will disappear.
x2 on the claybar.
i used to think that chrysler used terrible white paint on our '01 caravan and we decided to not get another white one. Then i saw it on our silver '04 and '07 vans as well as on my caliber. I eventually found out that its just contaminants that settle onto the paint from junk in the air. the claybar gets rid of them fairly easy and makes the paint butter smooth.