Where can I find a cleaning product called "glass wax"?

My Mom hates cleaning windows with Windex or similar products, because they always leave streaks, no matter what trick she has tried. She has a very old bottle of something called "glass wax" that she has almost used up. Apparently, you rub it on the glass wet, and then wait for it to dry to a haze. Then, you wipe off the haze with a clean cloth. No streaks, clean windows, ta da! We'd like to know if there is anywhere to still get such a product.