if anybody has a white trailer like i do you will no doubt be sick of the black streaks, well i have found the best cleaner, it is called awesome orange i buy it at the dollar store ] 3 bottles will clean a 16ft trl. wet the trl spray it all over i panel at a time brush it and hose of. i mean no black streaks. also every bit of road grime gone. it is fantastic.try it

Thanks for the tip James! The only thing I have found so far that will remove the black from my trailer, has been the detergent from a local car wash, but they aren't supposed to sell it to the public. Sometimes I get lucky and they will give me a small pail of the stuff, just to get me outta there.
Rod