340 duster call out numbers on the quarter panel removal adhesive question

I'm in the process Of redoing the 340 on the quarter panel on my duster Remove the vinyl numbers which was easy , but there is A ridge around the parameter of Where the numbers used to be.I can't get rid of it. Tried three m Adhesive. remover... I tried goofoff adhesive remover, Also tried lighter fluids.I can still fill a ridge with my fingernail. Is thoughts
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