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This dirty roof in Harrisburg, PA was the dirtiest one we @ Roof Cleaning by A&E have come across so far.  It was infested with moss and lichen.  The homeowner was given an estimate for a total roof replacement in the amount of $8000.00.  He looked for other options and found us Roof Cleaning by A&E on Google.  The moss was killed on the day of treatment with 3 applications of our cleaning solution.  It took about 3 months for the decayed moss to be washed off of the roof.  The homeowner called me about a month ago and told me he was extremely happy with the results of our non pressure roof cleaning and the thousands of dollars we saved him. You will see in the video that the downspouts were removed at time of cleaning, I did this because they were severely clogged with debris and had to be cleaned and then re installed after cleaning.  I plan on returning in the spring to take a final picture to add to my portfolio.  Call for your roof cleaning estimate today.  (717) 324-4208