Removing dried or sticky adhesive from glass

I've tried removing dried adhesive or sticky adhesive residue from glass with isopropyl alcohol and it has dissolved it really well but leaves some residue on the glass and it smears around when trying to finish it off. It's easy to end up with a 1 foot diameter mess that is almost impossible to get off. IG or Windex won't touch it, I ended up using a razor blade then to get this mess off. Am I better off with 3M adhesive remover or some other product that anyone knows of. IPA has always been my go to item for this before but now I am really gun shy.
 
I usually use Stoner IG with a razor blade in this situation. You could try goo gone, or even a tar remover, as long as the window isn't tinted.
 
Spray a little bit of goof off pro on a towel and wipe it back/forth across the glass. Your glue will be gone.
 
Even though I have, I couldn't imagine using solvent to remove glue/decals on glass on a regular basis. It's so easy and it won't damage the glass as long as the blade is new(sharp).
 
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