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Old 06-20-2012, 09:06 PM   #20
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Join Date: May 2003
Location: Marshfield, MA
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Use bleach or liquid pool shock(sodium hypochlorite) and T.S.P. or Jomax in a pump up sprayer.
Wet roof FIRST and all surrounding plants, bushes, grass etc. with plain water...then apply mix to roof. Let the chemical do the work. Sometimes a second application is needed.
Don't be afraid of the will NOT hurt asphalt shingles and is the ONLY thing that will work.

bleach is 6% sodium hypoclorite
liquid pool shock is about 12% sodium hypoclorite
I buy pool shock at Ocean State Job Lot to do all my exterior cleaning.

Live at Leeds
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