Big Rig Soap 30 gal. Heavy Duty Degreaser is a premium concentrated liquid degreaser formulated with the highest quality penetrants to promote rapid emulsification of heavy gear lube, high weight oils, hydraulic fluid, diesel and gasoline residue and other grease and grime. BIG RIG Heavy Duty Degreaser is especially suited for trucks, trailers, RVs, buses and other heavy equipment. Comes in a 30 gal. drum.BIG RIG Heavy Duty Degreaser is especially suited for trucks, trailers, RVs, buses and other heavy equipment.