Chewy what part of the country do you live in ? This will depend on whether or not its a solvent based or water based paint. In So Cal, were required by law to use a water based paint when we stripe local roads and highways....Your best bet is ol fashioned elbow grease and a couple bars of clay. Also, another source of success is a citrus based cleaner, (Bug and tar) get it at the local janitorial supply store, its MUCH stronger than the kind you get at auto stores. Apply cleaner, wait several agonizing minutes, and wipe with a cotton cloth. May need to do this several times. Like any cleaning product, try it in an inconspicuos place first. I had a friend whos wife ran over a can of paint and covered a good area of her Saturn wagon.......Best of luck !! You'll be tired !!