So some dumb high school kids were playing with paint in the middle of the road this past fall. Since then, even though it's dry people get it sort of sprayed up the side of their cars. I'd like to try to get it off there myself, if possible. I'm able to get it off by scraping a bit with my fingernail, but that's not really a feasible solution for all the paint that's on there.

Any ideas? Products? Cleaners?