A neighbor of mine brings his dump truck home and polishes the boxes, and wheels with a 7" grinder with a buffing wheel attached. He gets a mirror finish using Flitz. The stuff is expensive. But, he swears by it. I also bought a used boat (Duckworth) which was used in the salt alot and has gone to s---. Just haven't gotten around to trying his method. Next week I take the trailer in to have it sand blasted, and powder coated. So while the boat is on blocks in my garage I'll try it then. I'll let ya know how it turns out. Can't wait to get into some springers!!