How to Get Green Mold or Lichen Off Your House

Written by claudia henning
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How to Get Green Mold or Lichen Off Your House
Mold can be a sign of a great problem in your house. (Comstock/Comstock/Getty Images)

Mold or lichen on the exterior of the home is a sign that accumulating moisture has become a problem. Drainage issues and water leaks are the primary causes of external mould growth. You should remove mould immediately to avoid rotting of the siding or insulation of the interior wall. Chlorine bleach and water is an effective remediation method for exterior mould and mildew. Most homeowners are able to remove areas of mould in a couple of hours.

Skill level:

Things you need

  • Safety glasses
  • Chlorine bleach
  • Spray bottle or garden sprayer
  • Garden hose
  • Sponge

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  1. 1

    Mix a solution of 50 per cent chlorine bleach and 50 per cent water in a spray bottle. For a larger area, it is easier to use a pump-up garden sprayer.

  2. 2

    Spray the home exterior with a garden hose. Lightly wet the area to be cleaned. Spray a stream of the bleach water mixture onto the moulded surface. Rinse with the garden hose, starting at the bottom of the exterior wall and moving upwards.

  3. 3

    Spray the bleach water on any remaining mould stains, and let it sit for five minutes. Lightly scrub with a soft-bristle brush or sponge. Rinse with the garden hose from bottom to top.

Tips and warnings

  • Try to locate the source of the excessive moisture to eliminate the exterior mould problem.
  • Wear safety glasses when using chlorine bleach.
  • Take frequent breaks to rest the back.

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