After brewing, the beer equipment or automatic brewing equipment should be cleaned in time to keep the equipment clean. The international unified method, Ra, its physical meaning is the arithmetic mean of the cross-sectional profile error Y in the sampling length L.

       Dirt easily adheres to the surface of equipment and forms a certain adhesion strength. It is not only difficult to dissolve, but also difficult to wash off. Therefore, in order to remove the dirt on the metal surface, it is necessary to choose the appropriate cleaning agent and method to remove the stains adhering to the surface of the equipment. The effect of sewage particles is related to many factors, and its dispersibility depends on the "adhesion" force of the particle surface. Cleaning agents can reduce the adhesion of dirt particles on the surface of equipment and dissolve them.