[WE HAVE TRIED 2 STEP, WORKS WELL ON (COMPANY TRUCKS AND TRAILERS)BUT WE HAVE BUILT OUR REPUTATION FOR TRUCK WASHING BY GUARANTEEING OUR WASH JOBS, AND THE ONLY WAY TO DO THAT IS TO BRUSH THEM ANYONE ON MY CREWS CAN WASH A BIG BLACK SHINY PETERBILT IN 25 MINUTES(WINTER TRUCK) 30 minutes...