How Do I Clean Moss & Mold Off of Brick?

Written by april dowling
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How Do I Clean Moss & Mold Off of Brick?
Remove moss and mould from brick surfaces. (brick image by Albert Lozano from

Brick is energy efficient, extremely durable and simple to maintain. Although bricks require little maintenance, they are constantly exposed to dirt, dust and grime. Poor soil conditions, lack of sunlight and nearby wet vegetation can cause moss and mould growth on bricks. Bricks stained with dirt, moss and mould can cause beautiful structures to appear dingy and eventually deteriorate. Cleaning brick annually helps maintain a structure's appearance and ensures longevity.

Skill level:

Things you need

  • Garden hose
  • Plastic sheets
  • Rubber gloves
  • Eye goggles
  • Plastic bucket
  • 1 cup chlorine bleach
  • 1 gallon water
  • Wooden stir stick
  • Synthetic bristle brush

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  1. 1

    Spray the brick with water from a garden hose to remove as much dirt, grime, moss and mould as possible.

  2. 2

    Lay plastic sheets over any nearby vegetation. Put on rubber gloves and eye goggles for protection.

  3. 3

    Set a plastic bucket on another plastic sheet. Pour 1 cup of chlorine bleach and 1 gallon of water in the plastic bucket.

  4. 4

    Stir the solution with a wooden stirring stick. Scrub the bricks thoroughly with the bleach solution, using a synthetic bristle brush. Make sure the plastic sheets catch the bleach runoff so that it does not affect nearby plants and soil.

  5. 5

    Rinse the bricks thoroughly with water from the garden hose. Allow the bricks to air-dry.

Tips and warnings

  • If you are cleaning a brick wall, use a ladder to scrub hard-to-reach areas with the brush.
  • Do not use wire brushes for cleaning bricks; traces of steel from the wire may rust and discolour the bricks.
  • Test the bleach solution on a small area of a brick to ensure no discolouration occurs.

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