Re: Brew for cleaning filthy gas tanks Home › Forum › Ask A Member › Brew for cleaning filthy gas tanks › Re: Brew for cleaning filthy gas tanks jeff-registerUS Member - 2 YearsReplies: 1564Topics: 54 December 4, 2017 at 3:54 pm #68246 Pool acid, muratic acid if the tank is steel, Be careful & read instructions before opening, it’s nasty but will clean it!