The rotary nozzle is one of the most useful and powerful nozzles of high pressure washer. This nozzle is made of a zero-degree nozzle and, by inducing rotational motion to high-pressure water, increases the cross-section of sprayed water. The use of zero-degree high pressure nozzles and high cross-sectional in this nozzle, significantly reduces the time, which is needed to clean up deeper layers of contamination. This nozzle is good for cleaning paints, graffiti, rust, surface peeling and cleaning of contaminants such as oil and lubricants. During the selection of nozzles for cleaning operations, attention to the pressure level and the maximum temperature attained by the nozzle, has an effective role in reducing costs and increasing the speed of cleaning