Mildew/Mold build-up

Sissy
by Sissy
I have 13 white painted posts that hold up my porch and carport. Every winter they start turning green along with my white painted porch swing. Each Spring they have to be bleach down and sometimes repainted. Is there a product I can paint these wood posts with that will retard this green growth so I can just hose them down each Spring?
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Porch swing
Post
  10 answers