I use Birko products on my brewhouse, unitanks, kegs, etc.; Acid Bright # 2 followed with Bru-R-Ez (noncaustic cleaner) with great results. I've used Birko exclusively for six years and am very happy with their product line, cost effective as well!
Follow their instructions and you will be happy with the results.
Dana Johnson is the contact.
David R. Pierce
BBC Brewing Co., LLC