I had some of the siding replaced on my 1999 Pace Shadow race trailer, the older ones are dirty and streaked compared to the two new ones I bought some of the L.A Totally Awesome cleaning solution to help clean and remove the black streaks from the siding, my questions is to those that use this stuff how do you mix it, 50%, 40%, 10%, 80% or straight with no water or whatever else you mix with it that you found that works good