Removing sticker residue from windshield

Fingernail polish remover (acetone) will do it in seconds. Acetone will also attack the plastics in your car, and might discolor the leather. I’d put on rubber gloves and pour some fingernail polish remover on a folded paper towel. Do this a few feet from the car. Squeeze out the extra on the driveway (don’t squeeze too hard), and then rub the glue. You might need to hold the towel on the glue to soften it up. Turn the towel to a fresh side and remove the smeared stuff. Don’t rub the rubber gaskets. They will dissolve slightly. It won’t hurt the rubber, but could transfer to anything else the towel touches. You might follow up with rubbing alcohol. It will remove the smears, but won’t damage anything else.