Try using a wool bonnet on a drill and white polishing compound. That will usually polish out the etching and let you reuse the glass. You could get away with having laminated glass (like the wingshield) cut. Classic car people do that all the time but double pane windows are so much better. Anything without the air gap will be so much colder when the temperature drops. Single pane is for people who live and stay in Florida! You sleep so much closer to a window in an RV than you do in your house and when the window is 12" away you can really feel the cold sliding off of it..and get a lot of frost buildup when it's cold out.