How to remove a window decal drying?

I have a sticker on the back window of my car I'm trying to remove. However, has been cured of time and has become a pain to remove. I know there are many different techniques for removing the window decals, but I also read that most of these techniques do not work. Is there a safe way to remove a sticker from drying my car window? Thank you.

in a window? try a razor blade. on a body panel? try a razor blade and adhesive plastic cleaner

Easy Instant Decoration Wall Sticker Decal - Spring Flowers and Birds $10.21 Perfect for the holidays or all season long for children's and family rooms! These friendly looking cookie children will liven up any room and space! Made from high quality material they are scratch, peel, and fade resistant. Check out the other wall decals!...

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