I have used Mineral Turpentine in a spray bottle for over 20 years. Discovered how well it works by accident. Method, wash the vehicle first so all dirt and road grim have been removed . With the car still wet, spray the turps on to the asphalt spots one panel at a time. Wait a few minutes and you will see the black spots start to run as the turps dissolved the asphalt. Rub lightly with a damp porous cloth, I use a Chux dish washing super wipe. You may need to spray on a bit more mineral turps at this point. Hose off completely . Work your way around the car. Don't let the turps dry on the paint work . when finished, dry the vehicle as you normally would after a wash. Your car will be spot free with no scratch marks and it doesn't remove the shine if it was there before.