This may be a stretch but I would try eye makeup remover. It’s oil based, harmless and really good at getting gunk out! May be worth a shot!
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You can't buy a window (are they even replaceable?) but you can buy the panels, I had the rear panel replaced under warranty, took a couple of weeks to arrive, but it did eventually.Buddy says worst case he will buy me a new window. I told him I’m pretty sure you can’t just buy a window at this point.
Can't believe it took 4 pages. Yes, heat. Patience, plastic scraper.The secret here is heat. Use a blow dryer or a heat gun on the LOW setting and heat it up, then use the solvents others have stated and it should come off, with some elbow grease. I had a sticker do the same on my Bestop top on my wrangler. A little heat went a long ways with cleaning it off.
Whisky was already suggested, what makes you think beer will help? (j/k)Goo Gone does not work very well on some adhesives. IPA is the way to go.