Zip Clean, is a new invention that cleans the beds of dump trucks, without using any chemicals or Hevy equipment. The cleaner operates on perptual motion, and don't requie no hydraylick actions or power. When the bed is raised the the blades move downard cleaning out the bed, when the bed is let back down the blades return in place. Zip Clean is a patented product. Please call Gerome singleterry, sales agent at 205-668-4799. We now can offer you a DVD, showing a demonstrationof Zip Clean in action, cleaning Asphalt from a dump truck and cleaning dirt from a dump truck. Please contact us with your shipping address and we would gladly send you a DVD with Zip Clean in action.