Quote:
Originally Posted by RedDevil
The washer liquid should have some anti-freezing component and does not need being heated.
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That is mostly true nowadays. I'm not sure whether such liquid was unavailable back when I made my heated bottle, or whether I was just too cheap/poor to buy it. It was many years ago; I do remember filling up with tap water and a dash of washing up liquid.
The washer liquid I use in winter is marked as being OK down to -20C (-4F). It seems not to freeze until the temperature is well below that, but it does freeze eventually.