I've had the same questions and concerns here lately as I live in Iowa. In looking at some recent threads on the issue, I have decided to order some ONR for the winter washing. When it's just too cold to be dipping hands in water, I will be adding the ONR solution to a pump up sprayer, and soaking it down with this in a coin-op, then using clean water rinse only, followed by the spot free...then I can bring it home and touch up if desired. I tried this with just a car soap solution the other day and it worked great. Let the soap do the work, and don't get too close with the pressure wand, and I dont think it can hurt the LSP at all really. The ONR should be more effective than the soap I imagine.