When I bought my Z, the previous owner had put stick on letters (backed with foam) in the rear Corvette script. I pulled them off and they left some sticky goo. I have been using a goo be gone type of remover which worked on most of the goo, but it appears that the "R" and "V" might have fallen off and were glued down with something else. There is a hard clear resin in those letters that I can't get off. Anyone have any suggestions on what might work? I was able to pop some off with a small screwdriver, but I am scared to do more than the large bits because I may scratch the paint.