All Ontario Power Washing cleans our clients' roof with a LOW PRESSURE method that uses an anti algicide solution to get rid of those nasty black streaks and patches on your roof. 

Our cleaning method is safe for people, pets and your garden.  We take extra measures to protect your lawn and gardens.  

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The cost for our cleaning method to renew your roof is marginal and nowhere near the cost to replace your roof.

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Completely safe for your roof as per the Asphalt Roofing Manufacturers Association.

https://www.asphaltroofing.org/algae-moss-prevention-cleaning-asphalt-roofing-systems/