This piece of equipment was not designed to pre-wet the whole car or wash every windshield. A prep gun is effective if the proper distance between the nozzle and the car surface is maintained. If an employee moves the tip too far away from the surface, the cleaning power is lost. Try not to duplicate a function of the wash process that is already taking place in the tunnel. If it is not occurring in the tunnel, put this function on line and keep the car moving.
Volume decreases whenever a vehicle stops moving.
This goes back to continually training employees to touch only the areas needed with the most-effective tool. Time and motion are also critical in the prep area. Adding one or two prep buckets to the existing system can save hundreds of trips back and forth to dip the brush or mitt. Automatic shut-off stands save pumps, electricity and wasted steps. If the car is kept moving at a consistent, manageable rate, one car after another, the employees won't have to move.