Arrangement for monitoring the supply of cleaning liquid from a cleaning line 1 to a milking system where the milking system comprises at least two milking stations 4A, 4B, 4C, 4D and milk conduits 2. The cleaning line 1 comprises supply conduits 3A, 3B, 3C, 3D connectable to the milk conduits 2 at the milking stations 4A, 4B, 4C, 4D and arranged to apportion cleaning liquid to the milking stations 4A, 4B, 4C, 4D, so that cleaning liquid flows through the milking stations 4A, 4B, 4C, 4D. The arrangement further comprises a first control unit 7 and flow sensors 20A, 20B, 20C, 20D. Each flow sensor is adapted to measure a value of the flow of cleaning liquid through a particular milking station, and provide the values to the control unit 7.
