There are various types of hardware workpieces, and there are various structures. The main cleaning work is five aspects: wax removal, dust removal, rust removal, oil removal and debris removal. Most of the oil stains and dust on the surface of hardware workpieces can be manually removed, but for those hardware workpieces with holes and gaps, manual cleaning is time-consuming, laborious and not clean. Using an ultrasonic cleaning machine can quickly and cleanly solve the cleaning problem of hardware. It is safe and reliable, saves labor costs, has good cleaning effect, consistent cleanliness of the workpiece, does not cause damage to the surface of the workpiece, and greatly reduces the discharge of pollutants such as acid and alkali. protect environment.