Continuous systems are not labor intensive, so the washer would not need an operator at all times. The other distinction between models of aqueous parts washers is the method of cleaning that is used. The most commonly used methods of cleaning are immersion cleaning, spray cleaning, and ultrasonic cleaning. These methods are briefly described below. The parts are dipped into cleaner-filled tanks.
Immersion is often a batch process.
Spray cleaning may be batch or continuous. Ultrasonic Cleaning Ultrasonic cleaning is a special type of immersion cleaning in which high frequency vibrations are transmitted through the solution to produce a scrubbing action. It is effective in cleaning very small parts. The following equipment purchasing guidelines were developed by the Wisconsin Department of Natural Resources to help Wisconsin businesses identify and evaluate pollution prevention opportunities. Although it is not possible to cover every aspect of equipment selection, the list covers some of the more important points and provides considerations for evaluating aqueous parts washing equipment.