The Roof Cleaning Institute Of America Training & Certification Forum
"Find A Certified Roof Cleaner Directory"

First off, this is a great video fo a great product but wanted to point out where NOT to use this equipment. Pay attention to 2 minutes and 30 seconds into the video. What your seeing is this roof being destroyed before your eyes. Please keep this type of equipment and high pressure off roofs!

http://www.youtube.com/watch?v=N0vdq_LP9vw&feature=related