A young lady I talk to sometimes hadn't been out since we had the ice. She said she was going to pour hot water on her windshield. I told her I had heard it would break the windshield but I had never seen it. Anyway google button give me a forum called straightdope.com. Any it kept me up most of the night and I'll warn you some of the topics are somewhat odd and a couple were disturbing. That might have been what kept my attention. Anyway as far as the windshield goes the general consensus was it could expand cracks and chips but a new windshield would be ok, of course some said it would bust. It's an interesting site if anyone wants to check it out
Edit. Forgot to add their slogan was fighting ignorance since 1973
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