We hadn't been able to wash our unit since last summer because we've only been in CG's that won't allow even a Mobile Detailer.
I had ordered Dri-Wash-Guard from Amazon delivered to the CG last June. But had only used it on an occasionally spot. A couple of weeks ago, on a nice sunny afternoon, we managed to wash the whole unit with the exception of the roof. What a difference, especially on the rear with CG dust and road grime streaks.
http://www.amazon.com/Dri-Wash-Guard...5814707&sr=1-5