Removing race tire rubber on paint

I end up cleaning up many cars that have been on the race track and I'm trying to find something to remove the soft rubber that is thrown up on the paint. Bug and tar remover works but not very well, any suggestions?
 
I have been selling a number of racers Autoglym Internsive Tar Remover and have been told it works wonerfully for this exact purpose.
 
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