An assembly comprising: - · an object having a peripheral edge defining a tubular portion of the object that is open at at least one of its ends, this tubular portion presenting an inside surface; and - a cleaning device for cleaning said object, said the cleaning device comprising: · a cleaning enclosure arranged to have said object placed therein; · at least one first fluid feed duct opening out into the cleaning enclosure for feeding it with fluid; and · at least one first fluid discharge duct opening out into the cleaning enclosure in order to remove the fluid contained in the enclosure; said cleaning enclosure comprises at least first and second enclosure portions (111, 112), and the cleaning device being adapted to adopt selectively: · an enclosure-open configuration in which the first and second enclosure portions (111, 112) are spaced apart from each other to allow said object to be extracted from the enclosure; and · an enclosure closed configuration in which the first enclosure portion bears against the second enclosure portion in order to close the enclosure in leaktight manner; the device including at least one central zone of said second enclosure portion that, when the cleaning device is in its closed configuration, extends inside the first enclosure portion in order to define a reception space for receiving said object between the first enclosure portion and the central zone of the second enclosure portion, which reception space extends all around the central portion, said feed ducts (31, 41) being arranged to open out into said reception space for receiving the object, the assembly being characterized in that said object is arranged inside said reception space of the a cleaning device placed in its enclosure closed configuration with more than 90% of said inside surface being placed at a distance from said central zone of the second enclosure portion that lies in the range 0.1% to 10% of a maximum outside dimension of said object. - · an object having a peripheral edge defining a tubular portion of the object that is open at at least one of its ends, this tubular portion presenting an inside surface; and - a cleaning device for cleaning said object, said the cleaning device comprising: · a cleaning enclosure arranged to have said object placed therein; · at least one first fluid feed duct opening out into the cleaning enclosure for feeding it with fluid; and · at least one first fluid discharge duct opening out into the cleaning enclosure in order to remove the fluid contained in the enclosure; said cleaning enclosure comprises at least first and second enclosure portions (111, 112), and the cleaning device being adapted to adopt selectively: · an enclosure-open configuration in which the first and second enclosure portions (111, 112) are spaced apart from each other to allow said object to be extracted from the enclosure; and · an enclosure closed configuration in which the first enclosure portion bears against the second enclosure portion in order to close the enclosure in leaktight manner; the device including at least one central zone of said second enclosure portion that, when the cleaning device is in its closed configuration, extends inside the first enclosure portion in order to define a reception space for receiving said object between the first enclosure portion and the central zone of the second enclosure portion, which reception space extends all around the central portion, said feed ducts (31, 41) being arranged to open out into said reception space for receiving the object, the assembly being · a cleaning enclosure arranged to have said object placed therein; · at least one first fluid feed duct opening out into the cleaning enclosure for feeding it with fluid; and · at least one first fluid discharge duct opening out into the cleaning enclosure in order to remove the fluid contained in the enclosure; · an enclosure-open configuration in which the first and second enclosure portions (111, 112) are spaced apart from each other to allow said object to be extracted from the enclosure; and · an enclosure closed configuration in which the first enclosure portion bears against the second enclosure portion in order to close the enclosure in leaktight manner;