This extraordinary machine cleans/ passivates gas cylinders inside and out. The system has six (6) individual cleaning chambers, each with a powered door and automatic valves to control flows from 3 tanks and air blow-off. The parts are loaded and unloaded with a robot. A top pneumatic device secures the part before the robot lets go. Another pneumatic device inserts a nozzle though the part orifice. In each chamber, the parts undergo a 5 step process: 1) wash with fluid "A"; 2) rinse; 3) wash with fluid "B"; 4) rinse and 5) dry.