Roof Renew’s purpose is to extend the life of your aging shingles. That means restoring the function of the shingle. Roof Renew can have a cleaning effect over time because it does kill any algae or moss on your roof, but it’s purpose is not to clean the roof. If you have significant algae or moss on your roof and desire a clean roof in addition to extending its life, we recommend getting a professional cleaning using an approved method prior to treating with Roof Renew. Ask us about cleaning and we can refer you to one of our trusted partners. We’ll coordinate so that the roof can be cleaned first, and then treated with Roof Renew approximately 1 week later. You’ll be amazed at the difference in appearance, color enhancement, added life, and the savings!