The best thing to prevent those scratches is to use a high quality microfiber towel.
For models, a single 16x16 Ultra-Plush polishing cloth will go a long, long way. It has different pile heights on each side, which means it'll be more versatile, and thus a better value for your application.
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http://www.ultimatemicrofiber.com/productlisting.cfm
If you have any questions about any of our products, feel free to toss us an e-mail at
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Always glad to help!