Why should I have my roof cleaned? Cleaning your roof stained from algae is a cost saving alternative to pre-mature re-roofing. A stained roof is no longer able to effectively reflect sunlight and detracts from your home's curb appeal. A clean roof is a healthy roof. Roof Shampoo® contractors use low pressure state-of-the-art roof cleaning equipment and eco-friendly proprietary Roof Shampoo® soaps to remove those ugly stains instantly and completely.