A while back, when my Piper Archer's storm window latch broke, I temporarily secured the little window with duct tape. After fixing the latch and removing the tape, I now find that a crusty residue from the tape's adhesive remains on the Plexiglas. I've tried a variety of cleaners to remove the residue (which is now hard and crusty-even harder, it seems, than the window itself), and the stuff simply will not come off.
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