Exterior Pro Wash is your Guaranteed Safe, No-Pressure Roof Cleaning Company.  We use only the highest quality, bio-degradable detergents and the most effective and safest cleaning practices.  As experienced professionals, we believe in continuing education, industry certification and providing our clientele with informational articles from peers within our industry who’s cleaning processes mirror our own.

Taken from our Industry Publication:  UAMCC, Issue #2 Roof Cleaning

Once the roof is cleaned it will look like new again. The process of cleaning the roof, when done properly, results in complete visible algae removal. This means that new growth comes from new spores which travel through the air and land on your roof thus starting the cycle over again. These new spores are microscopic and invisible to the naked eye. As the new growth begins to accumulate it will layer over itself. These layers will start where the roof is the wettest, either at the gutter line or under the roof eves. The top layer is killed by the sun and turns black, forming a protective shell so the algae can continue to grow underneath. It will continue to grow until you start to see the discoloration again. It
can be a slow and very sneaky process. One day, years after a cleaning, you will look up and surprise – There it is again! Time for another roof cleaning.
The return rate varies from region to region and from roof to roof. The expected return can range from 2-7 years. The lower pitched roofs take longer to notice because of the pitch of the roof, but will be quicker to grow as they stay wet longer. This means that lower pitched roofs should be checked more often than steeper pitchedgeorge roofs. Not that you couldn’t see it if you looked, it is just harder to notice. An easy tip is to look at the roof after a good rain as the
roof starts to dry. The algae blooms will open up when they are wet or damp, so it darkens and gives it more body so you can see it better. The rain will begin to dry on the
roof forming a streak pattern. This pattern is where the algae will grow until it covers the roof entirely. Now that you know what to look for, you can catch it sooner rather
than later. This way your roof will always looks great and you can maintain the best image for the property.     – George Clarke, Outdoor Pro Wash and Current UAMCC President