The Roof Cleaning Institute Of America Training & Certification Forum
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These are from the last few months. I wish I could get myself to take pictures more often, but I just forget?

Here is some info on my business:

http://www.bergmanpressurewashing.com/

 Venice / Sothern Sarasota

Englewood, North Port,

Port Charlotte, Punta Gorda

698-1959

RCIA Certified Roof Cleaning.

http://roof-cleaning-institute.activeboard.com/f523639/roof-cleaning-englewood-fl/

We are also A+ rated by the Better Business Bureau { BBB } I am not "accredited" because I am not a paid BBB member.
http://www.bbb.org/west-florida/business-reviews/pressure-washing-companies/chuck-bergman-in-port-charlotte-fl-90024694

In the attached link, you can read how the Asphalt Roofing Manufacturers Association says to clean roofs. That is the only method I use. So your warranty will not be voided.

http://www.asphaltroofing.org/pdf/tb_217.pdf