u/K1NG5LAYR

I recently purchased a used car and someone tried to put that do it your self tint on the back window. I can’t see through it as it bubbled up and the adhesive is all sticky. I can peel it off, but I need something to get off the residue and adhesive leftover. Any ideas? If I use a scraper will it mess up the rear defroster? Should I add pics? Maybe I could ask the folks at auto zone to look at it lol ?