Removing spray paint from car paint can be done several ways .
1) WD-40, bug & tar remover, Goo Gone, Goof Off, Mineral Spirits, turpentine or other solvent unlikely to hurt car paint .
2) Cleaner Wax, Rubbing Compound or Polish ( Note- abrasive cleaners can dull the surface ).
3) Clay Bar, sometimes referred to as " detailing clay " . These come in various brands and coarseness grades and are used with either soapy water or special sprays to lubricate the paint .