Ahoy Mr. Buzzrd,
Most light scratches can be polished out using a mico-mesh polishing kit and plastic polish. It takes a little elbow grease, but the results are excellent. I recommend you get yourself a micro-mesh kit and Novus plastic polish from
www.micromark.com I've also found that once polished, a windshield, dunked in Future and left to dry, looks almost like glass.
Tom