I recently hired a buddy with a steam cleaner to clean up my 16 foot enclosed trailer so I could get it ready to sell. His equipment wouldn't take the black streaks from the roof off the white sides. He tried a couple of industrial cleaners he had with him...no go. He asked me to run to the Dollar Store and buy some "Awesome" cleaner. I bought 3 half gallon jugs for $3 each. We put it in a garden sprayer and went all the way around the trailer, soaking any discolored areas. He came right behind with the steam cleaner. 2 passes around the trailer and it looked like brand new. We were both amazed but he had been told the "Awesome" was really awesome. It worked for us and I only used a little over 1/2 gallon.