Abstract: Apparatus is provided which enables an operator to wash vehicles of various shapes, sizes and configurations efficiently and thoroughly. A pair of spaced longitudinally extending rails is suspended along either side of a vehicle washing station. A carriage beam extends transversely between the rails and is mounted for back and forth movement longitudinally therealong. A traversing carriage is mounted upon the carriage beam, and a travelling scaffold is suspended from the traversing carriage for movement therewith. A washing unit is mounted upon the travelling scaffold for movement up and down therealong. The washing unit includes a cantilevered boom upon which spray nozzles are mounted for discharging selected washing fluids under high pressure. The boom is pivotable upwardly and downwardly in a vertical plane, and is rotatable about its longitudinal axis. The nozzles are mounted upon the boom for oscillating pivoting movement.