We do get frost once in a while here. Even a bit of snow on the ground every 10 years or so. I do believe it is a felony to leave a Porsche outside in the cold on a winter night though.
For windshield de-icing I just run a hose over it for a moment and the ice washes away. This may not be nearly as effective in Nebraska or Wisconsin in winter but it worked for me on my work truck today. I don't recommend this for a 70s Targa as the top moisture seal is really just a suggestion.
