How long can a car stay in garage if temps drop below freezing

any solution in water lowers freezing point. Just some more that others.

salt, alcohol, orange juice,

gotta think back to 8th grade chemistry class. Freezing-point depression - Wikipedia

Now don’t use water wetter to replace anti freeze. We’re just talking a little bit cause of what it is and low concentration

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Not exactly...there are ways to raise the freezing pt as well as lower it....just my inner chemistry nerd talking.:D