Does anyone know about cleaning aquariums for an aquatic turtle? I know the rules are "don't use anything to clean it". I got that part. But I scrub and scrub and scrub with damn near boiling water and a scotch brite pad and there is still this foggy film that won't come off the inside of the glass. I even tried using a widget (one of those razor blades for cleaning stickers off of glass)...with little luck. I also read that you can use some products like baking soda or salt with really good rinsing, I tried this...and still the film.