How do you remove sun tint film from windows?

Previous home owner applied 2 layers of tint to my bedroom picture window. The top layer was peeling off, so I took that layer off, it left an adhesive residue, and now the layer that’s left is off in some places looking terrible! I’m going to use sun screens instead of the nasty tint. Any ideas? I tried a blow dryer, that didn’t help!

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