I've had an unopened mag-float magnetic glass cleaner sitting in an empty tank for a month and just decided to use it. AMAZING!!! I wasn't expecting to clear off all the crud on the front of my tank because I had tried many times before. Amount of algae on glass after cleaning, none! If you want a fast, easy, and dry way to clean the glass in your tank try a mag-float cleaner. You can find them online for close to 50% off if you look hard.