This customer was on the ball by calling us before any damage occurred by the growth on their roof. The key to longevity of your roof surface is to fix problems before they get out of hand. By calling us to remove the light Algae staining on this roof we were able to keep the cost down because of the minimal cleaning needed. The heavier the staining the longer time needed at the job site which raises the cost. It was actually nice to be able to clean this roof since this was one of the few we have contracted that didn't have Moss and Lichen all over.