3 x 4 lbs of PBW.  A total of 12 lbs of PBW.  PBW is my go-to homebrew cleaner.

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

Five Star PBW Cleaner (Powdered Brewery Wash), 4-Pound Jar, 3 Pack

Also: Five Star PBW Cleaner 4-Pound Jar | Star San Acid, 32 oz