Abstract: Equipment for automatically washing a vehicle as it is being moved by a conveyor through a treatment area. A horizontal spray bar is movably mounted on the vertical legs of an inverted U-shaped frame for vertical movement along the frame to maintain a generally constant spacing from the vehicle surface as it is being moved beneath the spray bar by the conveyor. The spray bar frame is pivotally mounted on a main stationary support frame to enable the spray bar to pivot out of the path of a moving vehicle in the event of malfunction of the spray bar raising mechanism. A sensing station having a plurality of vertical spaced sensors is located at the entrance to the treatment area and directs a plurality of horizontal sensing beams across the path of the vehicle. The beams are broken and closed in relationship to the profile of the moving vehicle and send signals to a programmable controller.