I had my brick chimney on my house partially rebuilt. the mason cut out all the old pointing with a grinder and the dust was incredible. my truck was far away but still got dusted with the very fine dust. I didn't realize it and let the truck sit for weeks. now I have a very fine dust stuck on my windshield and some on the front fenders and hood. anyone have any idea how to get it off? I didn't wanna wash it as I was worried the grit might scratch the paint. I used just windex on the windshield and it didn't do anything, the grit is still on there. any advice would be appreciated. thanks.