Hi Travis,
sorry to hear you found our Bathroom & Shower Cleaner struggled on your shower glass. We've overwhelmingly had positive feedback for the product on shower glass so we'd love to know a few more details so we can help - if you could email our team careau@koh.com and let us know what specifically was happening or not happening on the glass cleaning we'll see if we can offer some guidance to get things resolved for you. Ash