I just wanted to remind some of the newbies that not only houses have shingles. My city parks and rec. dept. in Tallahasse, Florida has been a blessing to me, and I wash most all of their "needs" now. For the hungry guys out there, you can always break out of the residential mold and pursue alternate "business" such as this....
Basically, what I'm saying is don't forget about municipal work. It can be real aggravating to finally get through to the "right" person, but when you do, it can be well worth your time and effort.
The after pictures are pre-rinse....I'll attach post rinse pictures by next week.