Quote:
Originally Posted by rlpaul
Please don't listen to the hot water on iced over glass advice. It can and will crack eventually. That's just plain physics.
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Side windows, at least in the US, are tempered glass and a lot more resistant to thermal shock. You want to avoid doing this on the windshield, however, as it is much more likely to fracture, especially if you use boiling water. If you read back, people are just recommending using "slightly warmer" water, which if you used 50-60* water, I doubt you will induce thermal shock.