After two failed attempts at a wash on the shingles, I opted to paint them. Unfortunately, since my original plan did not call for black shingles, I did not paint the underlying roof black. You can't really see with the naked eye, but taking a flash photo helps you see where to do the touch ups. I am going to put the cap on and then do a little contrasting texturing to the roof.
It felt good to get something done today.