I made my own windshields from a 2 mm polycarbonate sheet. The sheet cost about $ 80. It took me about 3 hours to copy my old windshield to the new sheet and cut it out with a dremel tool. Polycarbonate has plastic cover and is simple to rip off from the sheet.
I don’t say that this will work for you, but try Autosol metal polish on a little area of your old ugly windshield or door window. Rub it real hard with a soft cloth and then polish it with some common floating car wax. It sounds real crazy but I think you are going to be surprised by the result