Hello! Since my car purchase about a year ago, my windshield has carried away numerous tiny and a larger rockfall. These small (diameter < 0.5 mm, but very many) deteriorate the view forward in counterlight extreme. Also on the sliding roof are 2, and on the rear window (!) a stonefall. Now I ask myself: Is this normal or does someone like to throw stones on my car from the window. Or can it be that my disc somehow nothing out of I'd like to know that before I let the disc be renewed. Lg Michi