Very interesting info. I can contribute a simple automotive trick - isopropyl alcohol freezes at -126°F, and is darn useful in your windshield washer tank. A couple of pints will prevent freezing. I've also used it to thaw out frozen wiper blades. Fairly cheap, too.
FWIW, Up here at least, -20* wiper fluid is sold through the winter. That uses methanol (methyl alcohol) to depress the freeze point. It's available fairly cheap at most hardware stores.
Will isopropyl harm auto finish?
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
