At Fisher Beverage Systems and Draft Dr's Sales & Service we settle for nothing less than customer satisfaction, we provide prompt service and fair pricing. We offer many services; our most popular is beer line cleaning. Beer Line cleaning is an essential part of regular system maintenance. Bacteria, yeast, protein, mold, other organics & calcium oxalate (beer stone) can build up in your system quickly. These are the reasons to clean your draught beer parts & lines. Draught beer parts & lines are a food contact surface and should be treated as such.