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Welcome to the harsh reality of Canberra winter.
I've lived in the Canberra region for 30 years and have always used warm water without any problems. I start the car, get out and pour some of the 2L juice bottle (washed out) over the screen. Start the wipers on normal speed and then pour small amounts where the ice is re-forming (you can hear the scratching sound). Splash a bit on your rear view side mirrors and side windows (so you can see the mirrors). Splash a bit more on the screen if ice is reforming and off you go.
Existing cracks have not become larger. It only has to feel warm and it works fine. I agree if it's too hot it can be a problem.
Bruce
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