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What's That Green Stuff? How To Remove Mold From Your Plaster Walls

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Excessive moisture in your home can cause mold to grow in your home. Unfortunately, mold can wreak havoc on plaster walls, especially if it isn't removed quickly enough. As mold grows, it can cause the plaster to weaken, which may cause it to peel away from the wall. Mold can also cause health and breathing problems, especially if you have asthma or allergies. If you've discovered mold growing in your home, don't panic. With some careful cleaning, you should be able to eradicate the mold without damaging your plaster walls. Here are some easy-to-follow instructions for removing the mold.

Kill the Mold

Now that you've found mold growing on your walls, the first thing you'll need to do is kill it. While this is a fairly simple process, you'll need to make sure you do a thorough job or the mold can grow right back.

Supplies You'll Need

  • Plastic spray bottle
  • 1 cup each of hydrogen peroxide and vinegar
  • 2 ½ ounces of boric acid
  • Surgical mask
  • Rubber gloves
  • Paper towels
  • Plastic bag


  1. Pour the hydrogen peroxide and vinegar into your spray bottle.
  2. Add your boric acid and mix well.
  3. Put your rubber gloves and mask on.
  4. Thoroughly saturate the mold and surrounding area with the solution.
  5. Leave the solution in place for about 15 minutes.
  6. Use your paper towels to wipe the mold and cleaning solution off your walls.
  7. Place the paper towels in the plastic bag and discard.

Remove the Stain

Once the mold has been removed from your plaster wall, you'll still notice a faint green stain. This is because the cleaner was able to kill the mold but not remove the stain. To remove the stain, you'll need to treat the area with a stain remover.

Supplies You'll Need

  • Plastic spray bottle
  • 2 cups water
  • 1 cup chlorine bleach
  • Rubber gloves
  • Scouring pad
  • Paper towels


  1. Place your water and chlorine bleach in a spray bottle.
  2. Put your rubber gloves on.
  3. Saturate the stained area with your stain removing solution.
  4. Allow the solution to sit for about five minutes.
  5. Scrub the area with your scouring pad.
  6. Wipe the area clean with the paper towels.
  7. Repeat the process until all the stains are gone.

If you've got mold growing on your plaster walls, use these simple steps to get rid of the problem. If you discover extensive plaster damage during your clean-up efforts, you should contact a plaster contractor regarding plaster repairs.