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Pressure Washing Guide
Advice on Pressure Washing Services and DIY Pressure Washing Tips
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Midwestpro
Site Admin
Joined: 08 Oct 2007
Posts: 163
Location: Indiana
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 Posted: Sat Mar 22, 2008 8:29 pm Post subject: Roof Cleaner |
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The Asphalt Roofing Manufacturers Association, Owens Corning, and GAF recommend using a mix of bleach, trisodium phosphate and water to clean shingles suffering from roof algae.
The severity of the algae will depend on the strength needed but it can range from 1 cup of TSP, 1 gallon of bleach, and 4 gallons of water to 1 cup of TSP, 2.5 gallons of bleach, and 2.5 gallons of water.
They recommend applying it with a low pressure application, like a pump up sprayer or something similar. Allow the solution to dwell for 15-20 minutes before rinsing with a garden hose. Re-apply if needed. |
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