Hey all... Ever since I got the Libby it had hard water spots that would not come off with anything. No amount of window cleaner would take them off. The windows always looked dirty and I figured they were etched and beyond saving.. While cleaning up the kitchen it dawned on my to try the glass stove cleaner on the windows. I gave it a shot and it worked.. no more water spots. A couple spots required some additional applications, but in the end my windows are all clear and no scratches. Weiman sells a kit with the cleaner and an abrasive pad for around $6 at Walmart. ( Weiman Complete Cook Top Cleaning Kit). If you have stubborn water spots give it a try.