I had my back vinyl fence moved back a couple feet and some of the boards that were originally facing the back are now facing forward, so now there is this appearance that some boards are darker (dirtier) and some are lighter (cleaner). If you look closely at the picture, you will notice the clean boards and the dirty ones. What is the best way to clean this? The dirty boards originally had some green mold, but I got this off with water and scrubbing with a broom and now what is left dirt (at least that is what I think it is).
Here is a picture: