Brian C. Jackson cleans roofs that have been over run with ugly black stains and this staining is not cosmetic. This black staining is an algae and it is called Gloeocapsa magma and it is shorten the expected life span of the roof because this algae is feeding on the roof shingle. There are roofs in the town of Sandown, New Hampshire 03873 that have this same issue with algae and it has homeowners wondering what can be done about it. Well 1st of all the roof needs to be cleaned and cleaned properly with a safe non-pressure / soft wash application because using a power washer or pressure washer will only damage the roof . The use of a high powered machine is not recommended or approved by the ARMA(Asphalt Roofing Manufacturers Association) because this method can dislodge the roofing granules. To get more information on roof cleaning or any of the other exterior soft washing services just visit www.jacksoncontracting.net or call Brian @ (630)401-8408.