I was turned on to this by a customer who said her maid used it. I was using ArmorAll Windshield cleaner, but it wasn’t really getting the glass as clean as I wanted. I used the Invisible Glass and as far as I can tell it’s something like the old Windex (the stuff that worked). It has a nice chemical smell and the glass squeaks just like it used to do with windex.
Available at Ace and True Value Hardware stores or online.