When I was at Laguna Seca the guy next to me used a spray (Mothers R3 Racing Rubber Remover) to remove rubber marks caused by track marbles. I have a white car so the marks are really noticeable. I sprayed the liquid on the mark & with one wipe using a micro cell cloth the black mark was gone. I have had to rub & rub to remove the marks in the past. I wish they had this product years ago. I used it on both the painted part of my GT & the clear bra. It didn't effect either of them. I went to a few car stores in my area to buy some but they never heard of it. I just ordered it from Amazon. You don't have to be a track junkie to use it. If a gator is kicked up on the road this product will work also.
Ed
Ed