How safe is cold water, tipped onto an iced car windscreen?

Other answer:

Chris cc:
Cold water tipped anywhere is not safe at. It is safe all nestled and protected in a nice container, but once tipped out can be ravished by an animal, sunshine, vegetation and maybe even zombies! It will also instantly go into a state of suspended animation if tipped onto a froze substrate. That is not safe at all, poor water!

Windscreen will be okay though.

efflandt:
What for, to ice it up even more? When I was in the south once, apparently the locals did not have ice scrapers when it got cold. So they would throw a cup of warm water onto their windshield, which quickly turned into a sheet of ice.
Chris P:
Safe for you? Very.

Safe for the car? Might shatter, more likely to freeze – causing even more ice to form on the windscreen.

d:
safe but worthless – start car turn on 'defrosters' use a plastic scraper to remove as much ice as you can ,fill windshield washer tank with a winter washer fluid
boy boy:
i have been driving for more than 50 years ..in that time i have thrown warm water over my windscreen thousands of times …never cracked the screen once …but its only warm ..not too warm
STEVEN F:
Worst case, you have MORE ice on the window.
Best case, nothing happens.

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