I switched to cleaning our bright tanks under pressure about 3 years ago with Acid #5. Always cold. No need for heat. Love it. We have a mobile CIP brink, which makes it really easy. Fill the brink with Acid #5 solution, recirculate it in the brink, switch to tank sprayball, and then finally switch the pump suction to the tank bottom when the brink is empty. Takes less time, uses less CO2, less thermal energy (by keeping things cold and not paying for heat), and gets our tanks really clean. Even for "high" soil load beers like wheat. Just burst rinse a few times with cool water before you clean. Like the directions say. Really keeps beerstone formation down. We do a full alkaline wash every 5-7 times we use the tank. Mostly just to inspect and change out our carbonating stone for a fresh, clean one; and to thoroughly clean the gaskets & sample valve. I don't know why anyone else would do it differently. But there is more than one way.....
Phillip Kelm--Palau Brewing Company Manager--
Worldwide Brewery Installations