I've been using it to clean a 50 gallon tank I just bought off CL. Due to the tank being the size it is I saw it in the store and figured it would be a pretty easy way to get the cleaning done. The tank was clean when I got it but you never know how the previous owner cleaned it. (sure I could have asked but wasn't thinking at the time) Anyway should this stuff be enough? I've been spraying it down then wiping it out then drying a few times now.