Cleaning device (1, 100), comprising - a hollow input shaft (3, 300) which can be connected to a hydraulic pressure source, is accommodated in a first housing part (2, 200) and has a fluid channel (31, 301) with at least one lateral or axial input (32, 302) and at least one lateral output (33, 303), - at least one output hollow shaft (6, 600) fluidically coupled to the input hollow shaft (3, 300), accommodated in a second housing part (4, 400) and having a fluid channel (61, 601) with at least one lateral inlet (62, 602) and at least one lateral or axial outlet (63, 603), - wherein the input hollow shaft (3, 300) and/or the output hollow shaft (6, 600) is rotatably mounted about its longitudinal axis relative to the respective housing part (2, 200, 4, 400), - wherein a first chamber (51, 71, 501, 701) is provided at least between the input (32, 62, 302, 602) or output (33, 63, 303, 603) of the input hollow shaft (3, 300) or the input (62, 602) of the at least one output hollow shaft (6, 600) and an inner casing (53, 73, 503, 703) of a sealing bush (5, 7, 500, 700), - wherein the sealing bush (5, 7, 500, 700) is fixed in position and non-rotatable on the respective housing part (2, 200, 4, 400) and is arranged to embrace a section of the input hollow shaft (3, 300) or output hollow shaft (6, 600), - wherein regions of the inner casing (53, 73, 503, 703) of the sealing bush (5, 7, 500, 700) extending axially from the first chamber (51, 71, 501, 701) form a gap seal with the outer casing of the input hollow shaft (3, 300) or the output hollow shaft (6, 600), characterized in that - a second chamber (52, 72, 502, 702) is provided between an outer casing (54, 74, 504, 704) of the sealing bush (5, 7, 500, 700) and an inner surface of the housing part (2, 200, 4, 400), which is connected to the first chamber (51, 71, 501, 701) via a connecting channel (55, 75) and extends axially to the input hollow shaft (3, 300) or output hollow shaft (6, 600) from the connecting channel (55, 75) on both sides. - a hollow input shaft (3, 300) which can be connected to a hydraulic pressure source, is accommodated in a first housing part (2, 200) and has a fluid channel (31, 301) with at least one lateral or axial input (32, 302) and at least one lateral output (33, 303), - at least one output hollow shaft (6, 600) fluidically coupled to the input hollow shaft (3, 300), accommodated in a second housing part (4, 400) and having a fluid channel (61, 601) with at least one lateral inlet (62, 602) and at least one lateral or axial outlet (63, 603), - wherein the input hollow shaft (3, 300) and/or the output hollow shaft (6, 600) is rotatably mounted about its longitudinal axis relative to the respective housing part (2, 200, 4, 400), - wherein a first chamber (51, 71, 501, 701) is provided at least between the input (32, 62, 302, 602) or output (33, 63, 303, 603) of the input hollow shaft (3, 300) or the input (62, 602) of the at least one output hollow shaft (6, 600) and an inner casing (53, 73, 503, 703) of a sealing bush (5, 7, 500, 700), - wherein the sealing bush (5, 7, 500, 700) is fixed in position and non-rotatable on the respective housing part (2, 200, 4, 400) and is arranged to embrace a section of the input hollow shaft (3, 300) or output hollow shaft (6, 600), - wherein regions of the inner casing (53, 73, 503, 703) of the sealing bush (5, 7, 500, 700) extending axially from the first chamber (51, 71, 501, 701) form a gap seal with the outer casing of the input hollow shaft (3, 300) or the output hollow shaft (6, 600), - a second chamber (52, 72, 502, 702) is provided between an outer casing (54, 74, 504, 704) of the sealing bush (5, 7, 500, 700) and an inner surface of the housing part (2, 200, 4, 400), which is connected to the first chamber (51, 71, 501, 701) via a connecting channel (55, 75) and extends axially to the input hollow shaft (3, 300) or output hollow shaft (6, 600) from the connecting channel (55, 75) on both sides.