Road grim

looks like rail dust that is starting to rust embedded in the paint, try using clay or preferably iron-x or a similar iron removing product.
 
I get that on my white car sometimes clay takes it off most of the time.
 
I get this on the back of my car a lot too, thanks for the tips guys:)
 
Tried clay and some of it came off. Need to buy iron x. Thanks everybody
 
Tried clay and some of it came off. Need to buy iron x. Thanks everybody

My girl has a white Altima and she gets the same thing. IronX it, let it dwell for a little bit, then clay it with the ironx on it. Don't forget the clay lube.
 
I think the guys gave you the advice you needed already.
I'd clay it first and see what that does, it should remove most of it, if not all.
 
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