hey, need some advice, i was spraying a set of gates outside yesterday with a new brand of paint which is white spirit based rather than cellulose which i usually use, and this time overspray blew all over my grandads car and now has black spots all the way around it, he hasnt noticed yet but ive tryed tcut which works but not well enough, so on an unseen area i tried some white spirit on a cloth and all of it came off without damaging the paint underneath, so the question is, will it be safe to use the white spirit method on the rest of the car?, the car has 2 pack paint if thatll make any difference, thanks in advance