I will second the use of Frothe for winter cleaning. I've used it on several coated vehicles and haven't noticed any scratches or swirls. I weigh the risk of some of those vs keeping the dangerous salt on the paint here in Western NY. I'd rather do a quick correction in the spring than worry...
Yes, it took a few times to get used to it, but I'm kind of enjoying it. I've admittedly only used it on a car with Collinite 845 so it's already pretty slick after RW.
I'm sitting here in Western NY where it's currently blizzard like conditions and single digit wind chills and thinking what a nice problem 95F would be right about now.
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