A radiator having a header is cleaned by at least partially immersing the radiator in a cleaning liquid and then applying ultrasonic energy to the liquid. The cleaning liquid is held in a container which has a sludge pit along the bottom thereof. An ultrasonic transducer is mounted on a carriage and is movable above the sludge pit. A rack is provided above the movable transducer for holding or supporting radiators. The movement of the ultrasonic transducer is controlled in accordance with the width of the radiator being cleaned.
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