The roofing manufacturers addressed this roof stain issue years ago, and issued a national bulletin detailing how to remove the stains and prevent damage. To view the ARMA Bulletin and its prescribed cleaning method please visit this link: http://www.asphaltroofing.org/algae-discoloration-roofs. Our only modifications to the ARMA method is to use industrial bleach which breaks down to salt faster than household bleach and to substitute the TSP for eco-detergent.
We follow the manufacturer's guidelines by using bleach mixed with soap. The solution is simple, biodegradable, and safe for your roof when properly rinsed, but the application and rinsing process is back-breaking and dangerous work. Since plants can become dehydrated by the salt left after the chemical reaction we spend a large amount of time and effort protecting your landscaping. Each client has different needs and challenges concerning landscape protection, so, it is best to schedule an in-person consultation. Protecting landscape is the primary reason why we employ a two person crew for each cleaning project. Providing you a team of 2-3 professionals often make's our prices higher than our owner-operator competitors, but it is the safest option for us and for you. For roof cleaning prices please click here.