BIG RIG Truck and Trailer Wash is a premium concentrated liquid alkaline detergent formulated with the highest quality penetrants and surfactants to promote rapid emulsification of dirt, oil, grease and road grime. BIG RIG Truck & Trailer Wash is especially suited for trucks, trailers, RVs, buses and other heavy equipment. This detergent is especially formulated for use in automated truck wash and high-pressure washing equipment.