Never scrape the soft top windows or brush snow/ice off of them. They scratch very easily.
Do get a poly tarp to put over the top and bungee it down when the weather gets snotty, snowy or icy. I learned that trick from my PO who left an 8x10 tarp and bungees in the Jeep for that very purpose, bless his heart. :-D
If frost or icing is on the soft top windows, let your heater defrost from the inside.