I just used paper towel and some type of glass cleaner on mine.
Of course that was after we wiped the inside setting it up, with a cloth, and made nice large scratches. THEN, we were told , oh ya it scratches easier than regular glass. Thanks a lot.
In the time I owned it before moving, as mentioned , I cleaned outside like any tank and inside with my mag float. Making sure both were clean and contained no debris before cleaning. Never made another scratch