How do i remove paint overspray from my car?

My neighbour decided to spray his wooden fence with some sort of wood preservative and my car was parked at the other side (div!) and now I need to get it off. It comes off if i scratch it with my finger nail, but it would take ages to do it this way! I also tried usig a scourer, but that scratched the surface of the car (which I then had to sort out with rubbing compound and polish!).
 
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