Make sure you use a Sno Brum or something that doesn't have hard bristles. I had one this winter and had very little marring.
For info on coatings, I would recommend doing a Google search for "Autogeek forum" and "coatings." There's a TON of info to be had. A coating is a more permanent paint protection, almost like a second clear coat.
ETA: Start here: http://www.autogeek.net/how-to-apply...t-coating.html
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