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You can't just remove it, you have to actually kill the algae. Follow these steps to kill the algae:

  • Make a chlorine wash made with either one part household bleach to one part water or one part pool chlorine to three parts water.
  • Use a pump up sprayer to apply the chlorine mixture to the algae.
  • Allow the wash to stay on the surface for up to 15 minutes being sure to not allow the mixture to dry before rinsing it off. If the chlorine dries on the surface, just reactivate it by spraying it again.
  • Rinse the chlorine mixture off thoroughly
  • Repaint if necessary.

This should keep the algae away for at least a year; longer if you use a paint formulated with a good amount of mildewcide to repaint the area.

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Q: How do you get green algae off of a house?
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