Apple Roof Cleaning
Roof Cleaning Instructor
I learned how to chemically clean roofs in Seattle, a long time ago. Many roofs were wood shake, and pressure could blow them apart. We used to take a paint roller dipped in roof cleaning chemicals attached to a long wooden pole, and "paint the roof shingles" with this device.This is one of the most helpful threads for any new roof washer I have seen on any forum. Most of the companies in my area are pw roofs because they think that is the only way to get the thick carpet we have out here off. I see it all the time. No wonder the roofing companies work OT...
Do not laugh, we did not have roof cleaning pumps back then, and I cleaned many a roof this way.