Device for cleaning, in particular descaling, a body moving relative to the device in a direction of movement (x) and having a surface layer to be removed, in particular hot rolling stock, in particular slabs or strips, with a pressurized liquid, comprising - at least one nozzle holder which is rotatably held on a central bearing that is perpendicular or inclined to the surface layer to be processed, - at least one jet nozzle held in an arm (31, 32, 33) of the nozzle holder, from which jet nozzle the pressurized liquid is discharged in operation, - wherein the jet nozzle is oriented such that a fluid jet discharging from the jet nozzle in operation is applied to the surface layer in an inclined manner at an angle of attack (g) to the surface layer, - wherein a rotating axis with a supply line embedded therein for the pressurized liquid is accommodated in the central bearing, which supply line is connected to a feed line in the respective arm (31, 32, 33) of the nozzle holder, which opens into an inlet opening of a nozzle housing of the jet nozzle, - wherein the jet nozzle is rotationally driven in operation such that an angle (a) between the direction of movement (x) of the body and the orientation of the liquid jet exiting the jet nozzle is constant in the plane of the surface layer, characterized in that - the at least one jet nozzle is rotatably mounted on the nozzle holder about a rotating axis oriented parallel to the central bearing and is formed as a flat jet nozzle with a spray angle (β) of 0° to 90°, and that - in each arm (31, 32, 33) of the nozzle holder a first gear (7, 8, 18) is rotatably mounted, which meshes with a central second gear which is non-rotatably attached to the central bearing and a third gear (9, 10, 19) which is non-rotatably attached to the jet nozzle, wherein the second gear and the third gear (9, 10, 19) are the same size, - so that in the operation of the device, a vector defining the emission direction of the liquid jet being under a pressure of 80 bar to 1000 bar from the jet nozzle has no component in the direction of movement (x) of the body. - at least one nozzle holder which is rotatably held on a central bearing that is perpendicular or inclined to the surface layer to be processed, - at least one jet nozzle held in an arm (31, 32, 33) of the nozzle holder, from which jet nozzle the pressurized liquid is discharged in operation, - wherein the jet nozzle is oriented such that a fluid jet discharging from the jet nozzle in operation is applied to the surface layer in an inclined manner at an angle of attack (g) to the surface layer, - wherein a rotating axis with a supply line embedded therein for the pressurized liquid is accommodated in the central bearing, which supply line is connected to a feed line in the respective arm (31, 32, 33) of the nozzle holder, which opens into an inlet opening of a nozzle housing of the jet nozzle, - wherein the jet nozzle is rotationally driven in operation such that an angle (a) between the direction of movement (x) of the body and the orientation of the liquid jet exiting the jet nozzle is constant in the plane of the surface layer, - the at least one jet nozzle is rotatably mounted on the nozzle holder about a rotating axis oriented parallel to the central bearing and is formed as a flat jet nozzle with a spray angle (β) of 0° to 90°, and that - in each arm (31, 32, 33) of the nozzle holder a first gear (7, 8, 18) is rotatably mounted, which meshes with a central second gear which is non-rotatably attached to the central bearing and a third gear (9, 10, 19) which is non-rotatably attached to the jet nozzle, wherein the second gear and the third gear (9, 10, 19) are the same size, - so that in the operation of the device, a vector defining the emission direction of the liquid jet being under a pressure of 80 bar to 1000 bar from the jet nozzle has no component in the direction of movement (x) of the body.