Hi Guys,
My roof is almost never on so it was one of the last things on my mind. It was original paint, with a lot of whiting, and stains that cleaners did not seem to work on.
Also I got some specs of compound on it from working on the paint, so to put it plainly it was a mess.
I got what I needed to do a repaint, then something came up and I needed a quick fix.
Somehow, GOOGONE came to mind. I sprayed it liberally all over and got to work with a stiff brush. I am amazed at how well it cleaned up I then wiped it down with a clean cloth and kind of burnished it and voila. I think it came out quite well.
Might save some of you roof angina!
Let me know if it works for you.