A method of cleaning a converter, the method including the steps of: providing a heating unit for heating a cleaning fluid; providing a ring main for continuous circulation of heated cleaning fluid around the ring main; connecting the heating unit to the ring main; connecting the ring main to the converter to enable delivery of heated cleaning fluid to the converter; and providing a controllable cleaning fluid valve for delivery of a heated cleaning fluid, and providing a controllable rinsing fluid valve for delivery of a rinsing fluid; providing a controller for controlled delivery of a sequence of the rinsing fluid and the heated cleaning fluid to the converter upon recognition of a rinsing fluid delivery condition and a heated cleaning fluid delivery condition, respectively.