Patent ID: 7258749

Claim:
A low profile method by which vehicle wash liquid and debris are directed across an impervious surface to a perimeter containment trough, comprising the acts of: providing a flat wash pad which comprises lower support structure which rests upon a ground or floor level surface and top structure spaced above the lower support structure, the top structure comprising an exposed liquid impervious top surface slightly above the ground or floor level spanning continuous to at least one perimeter non-central edge of the impervious top surface; positioning a debris-carrying vehicle or other item to be washed upon the impervious top surface; washing the vehicle while on the impervious top surface causing spent wash liquid and debris to be displaced onto the impervious top surface; continuously directing spent wash liquid and debris during washing to and over the non-central perimeter edge of the impervious top surface to prevent buildup of debris on the top impervious surface; disposing an opening at a top of perimeter containment trough vertically below the perimeter edge and immediately above the ground or floor level surface; causing the spent wash liquid and debris to fall directly over the perimeter edge off the impervious top surface and thereafter vertical directly through the opening into the perimeter containment trough such that vehicle washing can continue while debris is simultaneously removed from the containment trough.