I just use vinegar in a spray bottle. Have it anyway for cleaning other parts of the aquarium and it works well on glass. It's a little harder to get it perfect but it is safe for the tank
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I use "Invisible Glass". Alcohol based aerosol.
I'm a rebel, I suppose - I spray it directly on the glass at a downward angle, and sparingly, then wipe it off with a paper towel. Before I discovered Invisible Glass, I used plain old Windex and did it the very same way.