BIG RIG Cannon Foam is a premium concentrated high-foaming liquid detergent formulated with the highest quality penetrants and surfactants to promote rapid emulsification of dirt, oil, grease and road grime. It's well-suited for trucks, trailers, RVs, buses and other heavy equipment. This detergent is especially formulated for use in high-pressure washing equipment with foaming cannons.BIG RIG Cannon Foam is especially suited for trucks, trailers, RVs, buses and other heavy equipment. This detergent is especially formulated for use in high-pressure washing equipment with foaming cannons.