Just my personal experience. Got asphalt oil all over my daughters car flying thru when they just put oil down. WD-40 took care of that. Parked a Ford Fusion with transmission trouble last november. Ended up sitting in the dock and the one place the roof just dripped, ended up splattering tar residue all over the car for 8 months. WD did not work, scotchbrite was not easy. When it got to the main point it was dripping, on the window, we got the invisible glass out and it was gone. Sprayed invisible glass on the rest of the car and it took all the old tar off too.