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The present invention relates to an apparatus for the wet cleaning of the nozzle ring of an exhaust-gas turbocharger turbine, comprising at least one turbine casing (1) having a gas-inlet casing (2) and a gas-outlet casing (3), a turbine impeller (5) arranged in the turbine casing (1) and carried by a shaft (4), a flow duct (8) being provided between the turbine impeller (5) and the turbine casing (1) for grinding the exhaust gases of an internal combustion engine and a nozzle ring (7) arranged upstream of the turbine impeller (5), at least one injection nozzle (11) being arranged upstream of the nozzle ring (7) and supplied with water (37) through a feed line (18), an actuator (23) being arranged in the feed line (18), said actuator (23) being operatively connected to a measuring element (28) for recording the changes of state of the exhaust gases, at least one radial recess (10) being provided in the gas-inlet casing (2) in the region upstream of the nozzle ring (7), an injection nozzle (11) being arranged in each recess (10) and connected in each case through a line (12) to the feed line (18) and a control element (27) being arranged between the measuring element (28) and the actuator (23).