Hello yall I'm new here and got myself a new 08 mustang.. Bought the car yesterday afternoon and today I'm shining her up and I'm having problems with the tail lights.. Previous owner had tint on the taillights and took them off, by doing this it left a glue residue on them and it became hardened.. I've put automotive goo gone on them and have had no luck.. Any suggestions on how to get the residue off?