If it is the tiny little specs, the clay magic trick will work like a charm. You use a clay bar and some Liquid polish, and rub it lightly across the paint. If it is alot of coverage, don't rub too hard just, stay at it, Keeping it wet for lubrication. The clay will pick up the specs with very little or no permanent damage at all. You will want to slap a coat of wax on it when you are done, though.
This will give any normal vehicle a pretty good shine too. It will smooth you paint down, removing tons of residue, like acid rain spots, hard water spots. tar, tree sap, and, after a good polish and wax, you will have the smoothest finish you have ever seen.
It really is good stuff. Especially if you live in an industrial area. Not that expensive, either.
-Eric
linkypoo to the instructions, there are other name brands out there too, this is just the commercial one we had at the dealership when I was younger. New Cars would come in all the time with crap on them from shipping, usually: rail dust and concrete dust. Mother's, Meguiars both have one too, I think.
http://www.claymagic.net/using-claymagic.htm
