What Can I Put on My Walls to Kill Mold?

Updated February 21, 2017

Mold is a type of fungus that can eventually decay most types of organic matter. This is because the mould spores gradually eat the organic matter. Because they need water to survive, mould spores tend to grow in areas with excess moisture and humidity. Prevent mould from growing out of control by killing it with cleaning solutions. Use one of several cleaning solutions to remove the mould spores.


Bleach is one of the most common cleaning solutions that will kill mould on hard surfaces, such as metal or plastic. It is not as effective in killing mould on wood, and it can damage upholstered surfaces or carpets. To use it, mix 1 part bleach with 10 parts water. Apply the solution to the mould growth with a clean cloth or sponge. Rinse the area with clear water. Be aware that bleach is toxic.


Borax is a natural product that will kill mould and remove it from your walls. Although it is natural, borax is toxic if ingested, so keep it away from children and pets. To use it, mix 1 cup borax with 1 gallon water. Apply the solution to the wall with a sponge. Work until the mould is completely removed from the wall. Don't rinse off the borax solution, as it will continue to keep the mould from growing on the wall.


Ammonia is another product that will kill mould on your walls. Toxic on its own, if mixed with bleach, ammonia creates deadly fumes, so do not use it with any bleach product. To use it, mix 1 part ammonia with 1 part water. Apply the solution to the wall with a clean cloth. Wipe up the area and rinse it with clear water.

White Vinegar

White vinegar is another natural product that you can use to remove mould from the wall in your home. White vinegar is a natural antibacterial and anti-fungal that will remove bacteria, as well as mould. To use it, spray the white vinegar on the wall and let it dry completely. Scrub off visible mould and wipe it away with a clean cloth. Let the white vinegar residue remain, as it will prevent more mould from growing.

Essential Oils

Essential oils are normally used in homemade cleaning solutions to add a pleasant fragrance. Two essential oils, however, have antibacterial and fungal properties. These are tea tree oil and grapefruit seed extract. To use them, mix 20 drops of either essential oil with 1 cup water. Spray the solution over the wall and let it stay there until the mould is dead. Scrub off visible mould growth, but leave the residue to prevent more mould from growing there.

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About the Author

Kaye Wagner has been working in the fields of journalism and public relations since 2006 and is a recipient of a National Hearst Award. She is particularly interested in home-and-garden projects, as well as beauty and fashion writing. An avid traveler, she also writes travel reviews and guides. Wagner earned a Bachelor of Arts in journalism from Brigham Young University.