Stoners Invisible glass...works for me...and I can relate to the brand name

 

Strange as it might sound, I have had great results with Tilex. Works equally great on my windshield as it does on my shower tiles. A final spray with plain water and use a crumpled up newspaper to dry it and you will be amazed>

 

I had the same problem. Whatever I cleaned the windows with only lasted a day. I treid Stoner, Amonia, vineager, every store bought product, even that stuff that supposedly is for new car film removal. i finally broke down and ordered th Zaino glass cleaner/polish, and I have not had a problem since.