Don’t use WD-40 on your windshield or windows. It’s an oily substance that will be very difficult to remove. Don’t have WD-40? Try a different bug an tar removing product. Your local auto store should have a selection of products you can use to take off the bugs. As a bonus, this method works well to remove tar, too.
Don’t use a tough sponge or steel wool pad to remove bugs from your car - it will scratch your paint. If you catch the bugs before they completely dry, one pass should be enough to clean them off. If the bugs have dried into the paint, you may need to clean the car once, then do another application of WD-40, let it soak in, and clean the car again.
Spray your windshield and windows with soapy water. Let it soak in for 10 minutes. Scrub away the bugs. For the toughest spots, use a scrubbing sponge.
Be careful. Tree sap is soft, but it can also crystallize, and the crystals may end up scratching the surface just like glass.
If the sap is difficult to remove, cover it with WD-40, which should help it loosen up. Don’t use WD-40 on your windows, though. Don’t use a scrubbing sponge or any other rough material to scrub the sap from your car’s body, because the paint will likely come off with the sap.
WD-40 (not for use on windshields and windows) Goo gone Peanut butter Commercial tar remover