Has anybody tried Zaino's Z-12 on a windshield with heads-up display. Zaino states : Due to recent manufacturer inconsistencies in glass production, it is necessary for you to test a small inconspicuous area prior to use to make sure it doesn't scratch the surface. I got some spots on my windshield from detailing the car recently and windex or any other regular stuff just doesn't do a good enough job of removing them completely so I thought to give a Z-12 a try.