Vehicle washing system

A vehicle washing system, particularly adapted for concrete mixer trucks and bulk material tank trucks, includes spaced apart arches having opposed legs and transverse members with arrays of spray nozzles mounted thereon. Longitudinal spray manifolds are mounted midway on the transverse members of each arch to provide suitable washing of rotatable mixer drums and tank trucks. A driver operated control panel is mounted spaced from one of the arches and is provided with selector switches for actuation in accordance with the type of vehicle to be washed for actuating a valve to cause washing fluid and rinse fluid to flow to the respective arches. Washing fluid is conducted to one of the arches by way of a venturi mechanism which inducts a mixture of an acid solution and a surfactant solution into a pressure water stream prior to conducting the washing fluid to the arch.