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It's called rail dust just Google it. I suggest doing what Dackel suggested which is using Iron X which will get rid of most to all of it followed by a clay bar and a good wax. You could just clay it but the Iron X makes it a hundred times easier. Also make sure to put a sealant or wax after the Iron X as it will eat up previous waxes.
Do not use Meguiars ultimate compound or any other polish as shemeld_135 suggested without first doing the above. The Meguiars product or any other polish must be used only after cleaning and decontaminating the paint.
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