Using this device and method for cleaning material

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PROBLEM TO BE SOLVED : To provide a washing apparatus capable of efficiently, effectively washing a washing target article such as a rare-earth permanent magnet.SOLUTION : Provided is a washing apparatus comprising a washing tank in which at least a pair of ultrasonic transducers is disposed to face upper and lower surfaces of a net conveyor moving through a tank body part, respectively, conveying a washing target article mounted on the net conveyor between the upper and lower ultrasonic transducers within the washing tank into which a washing liquid is filled, the washing apparatus being configured to convey the washing target article mounted on the net conveyor in a state in which the washing target article is restrained on the conveyor by a pressing net except for an area between the upper and lower ultrasonic transducers, the washing liquid being constantly supplied into the washing tank and constantly discharged from a washing liquid exhaust port provided in a bottom surface of the washing tank during operation of the apparatus, and a state in which the washing liquid is filled in the washing tank being able to be kept by setting a supply quantity of the washing liquid supplied into the washing tank larger than a discharge quantity of the washing liquid discharged from within the washing tank.