I take very good care of my vehicles and now have learned better ways to do so reading from your site thank you. My question for you is, one of my cars is black and was parked under a tree and has tree sap on it. I have tried bug and tar remover, rubbing alcohol and even tried 3m Perfect It compound with my Porter Cable. The compounding took some of it off but there is still some on it. Any help would be appreciated. Thanks.