We have a huge catalpa tree. They are beautiful, but don't ever park under one. I have tried everything to get the sap off of my car. Chemical Guys tar/sap remover, Goo-Gone, rubbing alcohol, WD-40 and on, and on. It's almost like it's baked into the clearcoat at this point. Any ideas on what to try before I break out the polishing wheel and hit it with polishing compound?