There are several options of cleaners that professionals use to clean your roof, but many include bleach. The disadvantage is that bleach will discolor your walls and siding wherever it streaks down, and will also kill any plant or animal life along the way.
If you are looking to pressure wash the roof yourself, consider using an environmentally safe product such as Biocleanse. This is not only important to protect your house and plants, but also for your personal safety because the inevitable back spray from washing will end up on you as well.
A good quality power washing chemical will reduce total cleaning time. Rinse with plenty of fresh water after you are done.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm