Great comments, all! We're currently sitting at about 5F here with a -10F wind chill, so running any kind of water outside (at least here at my house) is a bad idea. The garage does stay above freezing (currently 38F), so some kind of rinseless product might be an option.
I'll have to check out the self serve manual spray car washes to see if any of those are open / operating. Maybe they've been wise enough to plumb themselves with warm water for winter use.
We climb all the way to 21F tomorrow, but the wind picks up and the wind chill plummets (school has been cancelled since it will be -20F with the wind). At ~20F I don't feel as bad about running someone else's water - at least it won't freeze to the car as fast as I can spray it!
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