Join Date: Jun 2005
Location: Collinsville, IL
Plastic doesn't rust, BUT...brake dust and rail dust does.
If you have contaminants stuck into the surface of your paint they can rust and create small little rust speckles. A good medium or agressive claybar will remove them no problem.
It's a good idea to claybar every so often so this kind of thing doesn't happen. When a car is shipped by train, the rail dust (little shards of metal) from the tracks can settle on the car. The same with brake dust. Normal washing won't remove the little shards of metal that make up the dust as they've become embedded in your topcoat.
I'm thinking (since the areas are right behind the wheels) that this is from brake dust. Heck, if the car has been driven during winter it could be metal shavings from the snow plow's blade.
Last edited by W3ap0n-X; 07-31-2007 at 10:57 AM.