I just finished cleaning all the algae* off the inside walls of my reef, and I noticed that the outside is also dirty. It is mostly from dust/etc. and water that ran down the side that was wiped off but didn't fully evaporate. What I would like to know is- What is the best way to clean this off?? I would think a damp cloth but that also leaves streaks on the glass. I am weary of getting any kind of chemicals or cleaners near the tank but when I see the bottle of Windex it makes me wonder...? What do you guys think?