NOVELTY - An enzymatic detergent drain cleaner composition comprises an acid lipase with hydrolytic acitivity to glyceride linkages and an acid cellulase enzyme with hydrolytic activity to beta-glycodisidic bonds to degrade and remove bacterial cellulose and glycerides.    USE - The cleaner is useful for removing or preventing glyceride deposits and cellulose deposits produced by microorganisms such as Acetobacter bacteria in aqueous systems.    ADVANTAGE - The cleaners, compositions and methods are safe and economical, do not require the use of chemicals that are hazardous or toxic to humans and other life forms, decrease the risk of environmental harm, and minimize ecological harm to the aqueous systems. The cleaner containing both acid lipase and acid cellulase enzymes has enhanced hydrolytic action of cellulose and glycerides compared to cleaner containing only acid cellulase enzyme.    DETAILED DESCRIPTION - An enzymatic detergent drain cleaner (I) comprises:    (1) 0.005-20 wt% of an acid lipase having hydrolytic activity to ester bonds, specific to glyceride linkages;    (2) 0.005-20 wt% of an acid cellulase enzyme having hydrolytic activity specific to beta-glucosidic bonds;    (3) 1-70 wt% of a water soluble carbonate salt;    (4) 1-70 wt% of a water soluble acid that reacts in aqueous medium at standard temperature and pressure with the carbonate salt to form at least 100 ppm CO2 that dissolves in the aqueous medium;    (5) 0.1-10 wt% of a surfactant; and    (6) 0.05-5 wt% of a thickening agents.    INDEPENDENT CLAIMS are also included for:    (1) an enzymatic detergent drain cleaner comprising:    (a) 0.005-20 wt% of an acid lipase having hydrolytic activity to ester bonds, specific to glyceride linkages;    (b) 1-70 wt% of a water soluble carbonate salt;    (c) 1-70 wt% of a water soluble acid that reacts in aqueous medium at standard temperature and pressure with the carbonate salt to form at least 100 ppm carbon dioxide (CO2) that dissolves in the aqueous medium;    (d) 0.1-10 wt% of a surfactant; and    (e) 0.05-5 wt% of a thickening agents;    (2) a composition (II) for removing or preventing bacterial cellulose and glyceride deposits in an aqueous system comprising an aqueous solution of an acid lipase enzyme in an amount of 0.005 wt% and having hydrolytic activity to ester bonds, specific to glyceride linkages and an acid cellulase enzyme in an amount of 0.005 wt% and having hydrolytic activity specific to beta-glucosidic bonds, the aqueous solution having a dissolved CO2 concentration of at least 100 ppm at standard temperature and pressure; and    (3) a method of removing or preventing bacterial cellulose and glyceride deposits in an aqueous system comprising:    (a) forming an aqueous solution by adding together (I) and an aqueous medium;    (b) contacting an aqueous system with the aqueous solution to at least partially hydrolyze the bacterial cellulose and glycerides; and    (c) removing the partially hydrolyzed bacterial cellulose and glycerides from the aqueous system.