Our chemical soft wash roof cleaning process is specifically recommend by shingle manufacturers. We apply the solution to your roof and let mother nature take over from there. There is no use of any pressure during our cleaning process. By leaving the solution on the roof, you end up with a cleaner roof then just rinsing off the cleaning solution after applying. After each rain your roof will look cleaner. You will be able to get two to three good cleanings with one application. This will leave your roof looking new again for many years to come. Clear-Vue offers a one year unconditional warranty on all roofs we clean. If within the one year period the black streaks re-occur, we will come re-apply our solution no questions asked.