An arrangement for automatically cleaning teat cups of a rotary milking platform includes i) a cleaning device at the side of the platform, the cleaning device having a movable part provided with an outlet opening through which a cleaning fluid is supplied to the teat cups; and ii) a positioning unit arranged to provide positioning of the cleaning device to a cleaning position in which the cleaning device is able to supply the cleaning medium from the outlet opening to the teat cups, the positioning unit adapted to provide a positioning of the movable part of the cleaning device in relation to the teat cups from an inactive position on the side of the platform to an active position in which the movable part extends in over the platform towards the teat cups to the cleaning position.