How to Get Rid of Mildew on Brick


Mildew is typically green, brown, black and even white in color. It forms on surfaces that are damp, shaded and have high levels of humidity, and, if left untreated, it will spread further. So if you find mildew on your brick walkway, house or even basement walls, clean it away promptly. Use the right cleaning methods and products to ensure you eliminate the mold without damaging the brick in the process.

Things You'll Need

  • Stiff scrub brush
  • Plastic sheeting
  • Bucket
  • 1 cup liquid chlorine bleach
  • Garden hose
  • Spray bottle
  • Brush over the mildew spots with a stiff scrub brush. This will remove as much loose mildew from the surface as possible. If the brick surface is indoors, lay down plastic sheeting on the floor below to protect the area.

  • Fill a bucket with one gallon of warm water. Add one cup of liquid chlorine bleach.

  • Spray down the brick with water. For outdoor brick, use the garden hose. Spray indoor brick with water from a spray bottle.

  • Dip a clean, stiff scrub brush into the bleach mixture. Scrub the mildew spots vigorously with the bleach and scrub brush until they are gone. Rinse the scrub brush frequently into the bleach mixture so you don't reapply mildew to the surface.

  • Rinse the brick thoroughly with plain water from the garden hose. If the brick is indoors, fill a clean bucket with water, then use rags and water to rinse off the brick.

Tips & Warnings

  • Mildew on outdoor brick can also be removed using a power washer. Choose a power washer with 3,000 psi or less to avoid damaging the brick. Use a wide spray setting and hold the nozzle about 12 inches from the surface. Move the wand back and forth over the spots until the mildew is gone.
  • Wear rubber gloves, old clothing and protective eyewear when using chlorine bleach.
  • If working indoors, be sure to ventilate the area well by opening windows and turning on fans.
  • Avoid using wire or synthetic bristled brushes when cleaning brick. Instead, choose a stiff scrub brush made from natural fibers.
  • Cover surrounding foliage, flowers, plants and landscaping when cleaning outdoor bricks with chlorine bleach.

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