I have a few wear areas, one is where you step into the cab on driver side, other the tailgate and rear bed where the plastic does not cover the worn blue paint. Some idiot sprayed something on the worn down paint like silicone, rather than refinish the worn off paint properly. It is almost impossibly hard to remove and refinish with new paint, what a pain. Even hard wet sanding does not remove the contamination.
What I found helped was using a SS scouring pad and blue dish soap and comet and scrubbing the living hell out of the worn down paint surface, then wet sanding. Simply wet sanding does not remove the 'silicones' or whatever some one used. What hapens is anything that gets painted, primer etc... forms fisheyes where the paint is repelled. Whatever was used is extremely durable, it seems to have embeded itself into the existing paint, like deep cancer because even heavy wet sanding wont remove it very well. And they put this crap where ever the blue finish rubbed down, even where the weatherstrip had worn the blue paint. I wonder what they sprayed on the weatherstripping. Was it some idiot used car dealer detailer?
Putting silcone or silicone like products on paint is always bad idea regardless of what the product people say. I was reading a post from a Meguiar's product guy from a manfcaturing rep (I think) that end users have no right to complain becuase REAL CAR PAINTERS know how to prep paint to prevent fisheyes caused when people use their products on paint. That really got me the attitude. Now this detailer has 43,000 posts yet you can see the arrogance and actual disdain in his post for people who have to paint after someone uses their products. It's like SO WHAT, deal with it,
I should not have to strip all the paint to bare metal for minor touching up because someone used something geeky or nanotech miracle shine to make it slicker looking. Well whatever they used makes it feel very slickery.