Cleaning system for cleaning mould segments (2, 3) of a mould press, the cleaning system comprising a frame, a dry-ice container and a nozzle, which is connected to the dry-ice container via a flexible hose, for forming a dry-ice jet, wherein the nozzle is operatively connected to an adjusting unit, wherein the nozzle can be moved relative to the frame by electrically actuating the adjusting unit, wherein the nozzle is arranged on a tool of a robot unit having a plurality of robot arms (8a, 8b, 8c), wherein the robot arms (8a, 8b, 8c) are connected to each other in an articulated manner and can be pivoted in relation to each other in such a way that the nozzle can be moved freely in space when the robot unit is actuated, wherein a rear robot arm is connected to a robot foot of the robot unit rotatably about a rotation axis, wherein the robot unit is fastened to a holder of the adjusting unit via the robot foot, wherein the holder is oriented in such a way that the rotation axis of the rear robot arm is oriented substantially horizontally in an x-direction in order to allow the adjusting unit to move the robot unit to a start position between the mould segments (2, 3) of the mould press, characterized by a camera for capturing a reference region situated on the mould segments (2, 3) and/or on the mould press, and a control unit which is designed to actuate the adjusting unit for setting the start position of the robot unit in such a way that a structure fixed to the camera is oriented in a defined position relative to a reference object arranged on the mould segments (2, 3) and/or on the mould press in the reference region, and a distance sensor for measuring a distance between the tool and the mould segments (2, 3) and/or the mould press, wherein the control unit is designed to electrically actuate the adjusting unit for setting the start position of the robot unit in such a way that the distance approximates a reference distance. wherein the nozzle is arranged on a tool of a robot unit having a plurality of robot arms (8a, 8b, 8c), wherein the robot arms (8a, 8b, 8c) are connected to each other in an articulated manner and can be pivoted in relation to each other in such a way that the nozzle can be moved freely in space when the robot unit is actuated, wherein a rear robot arm is connected to a robot foot of the robot unit rotatably about a rotation axis, wherein the robot unit is fastened to a holder of the adjusting unit via the robot foot, wherein the holder is oriented in such a way that the rotation axis of the rear robot arm is oriented substantially horizontally in an x-direction in order to allow the adjusting unit to move the robot unit to a start position between the mould segments (2, 3) of the mould press, characterized by a camera for capturing a reference region situated on the mould segments (2, 3) and/or on the mould press, and a control unit which is designed to actuate the adjusting unit for setting the start position of the robot unit in such a way that a structure fixed to the camera is oriented in a defined position relative to a reference object arranged on the mould segments (2, 3) and/or on the mould press in the reference region, and a distance sensor for measuring a distance between the tool and the mould segments (2, 3) and/or the mould press, wherein the control unit is designed to electrically actuate the adjusting unit for setting the start position of the robot unit in such a way that the distance approximates a reference distance.