Of the cleaning agents, sodium hydroxide (NaOH), otherwise known as caustic soda, is widely used in breweries worldwide. Its effectiveness in dissolving proteinaceous soils and fatty oils by saphonification is virtually unsurpassed. This makes it a natural choice for cleaning sludge off the bottoms of boilers and for cleaning beer kegs. Sodium hydroxide is an acutely excellent emulsifier too. It is unrivaled in its ability to dissolve protein and organic matter if used in conjunction with chlorine, surfactants, and chelating agents.