The best way to relocate your insect collection off your windshield is to lay a clean, very wet towel with plenty of nap on the bug-splattered side of the windshield for a couple of minutes. Let the water soak and soften up the offending insect carcasses. Once the water has softened them up, the bugs and their juices can be wiped away easily, using the same wet towel, without scratching the plastic. Be sure you don't use any kind of paper towel, as it will cut into plastic. Follow up your wet wipe with an application of your favorite cleaner-polish. We're partial to Pledge because it's inexpensive, fills small scratches and its basic solvent does a good job of unsticking bug entrails.