I know it works for bumper stickers, dunno about acrylic stuff. But for bumper stickers if you smear Mayo on them and let em sit for an hour or two, itl' soften up the material and glue enough to wipe it off.
Dental Floss, Get some glide floss, if it's doublestick tape. Work it under the tape, and basically saw it off. Won't damage the windshield (used this to remove the decals on my tank). Then use a credit card to carefully scrape off any of the remainder, and then use Goo-gone to get rid of the sticky residue. If you're careful the decal will come off intact.
Learned the Dental Floss trick from fellow Buell riders, the tank decals are 3D on their tank (it's really an air intake) and alot of them like to remove them without screwing up the Lexan tank/air intake cover.
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