so? that ends it?
I once poured boiling hot water on the windshield of my old MG and the windshield almost blew up on me. It cracked like a firecracker.
So, next time, I was at a work site in Pittsburgh and the ice froze over the windshield of my Chevy Suburban so I poured ethanol lab ware cleaner on the windshield and lit it. It started a small fire in the air vent. No problem, once I found the extinguishers.
I now keep a spare gallon of the blue (ethanol) stuff in the back of any vehicle I may be driving during winter, its a lot cheaper in the long run.