We just wrapped up a job in Cambridge featuring almost all the services we offer. We did a partial roof cleaning(the front), an exterior house wash and an internal and external window cleaning. We also lightly washed the rear deck of the house and pressure washed the front side walk. The green moss bunches you see are now dead and will gradually fall off within the next couple rainstorms. It is a bad idea- actually dangerous to the roof, to remove those Moss bunches on the same day as the cleaning. The Moss actually has a root system that grabs onto the shingle and to remove it with Force would remove the life of the shingles.