Parking under one tree for two nights stained our roof an ugly brown. No amount of scrubbing would remove all of it. If you are like me you would not want truckers seeing a stained roof, so I made a trip to AutoZone to get six rattle cans of paint. Most any auto parts store carries the Dupli-Color line of paints. The color for late model Ford's is Oxford White. It's the same white used on the side of the coach.
The cost is about $8 a can for the small 8oz can. You can pay more at a Ford dealer and from Amazon.