Yes, borax can kill mold. Borax is a natural fungicide and detergent that effectively inhibits mold growth and removes existing mold. Mix a borax-water solution, apply it to the affected area, and scrub to treat mold infestations.
Understanding Mold and Borax

Definition of Mold and Its Common Types
Mold is a type of fungus that grows in the form of multicellular filaments called hyphae. It thrives in moist environments and can appear in various colors, such as black, white, green, or orange.
Common types of mold found in homes include Aspergillus, Cladosporium, and Stachybotrys, often known as black mold. These molds can grow on many surfaces like walls, ceilings, and fabrics.
Why Mold Is a Problem in Homes?
Mold in homes can cause various problems. It can damage household materials and surfaces, leading to structural issues.
Mold also poses health risks, especially to those with allergies or respiratory conditions, as it can trigger symptoms like coughing, sneezing, and throat irritation.
Moreover, mold can produce a musty odor that affects the overall indoor air quality.
What Is Borax and Its Chemical Properties?
Borax, also known as sodium borate, is a naturally occurring mineral composed of sodium, boron, oxygen, and water.
It has a pH level of about 9, making it slightly alkaline. This property contributes to its effectiveness as a cleaning agent and its ability to inhibit mold growth.
Borax is water-soluble and can be used in various forms, such as powder or solution.
Historical Uses of Borax in Cleaning and Mold Prevention
Historically, borax has been used for over a century as a household cleaner and laundry booster.
Its ability to clean and disinfect made it popular for preventing mold growth in damp areas of homes.
Borax was often used to treat textiles and other materials to prevent the growth of mold, showcasing its longstanding use as a natural fungicide.
The Effectiveness of Borax in Killing Mold

How Borax Works Against Mold
Borax combats mold by disrupting the growth of mold spores. As an alkaline substance, it creates an environment that is inhospitable for mold, which prefers more acidic conditions.
Furthermore, borax penetrates into materials, preventing mold roots from taking hold and causing further damage.
Comparison of Borax With Other Mold Remediation Methods
When compared to other mold removal methods, such as bleach or commercial fungicides, borax is a safer and less toxic choice.
Unlike bleach, borax does not emit harmful fumes or leave behind toxic residues. It is also more gentle on surfaces and does not break down fibers like bleach can.
Borax is more environmentally friendly compared to many chemical mold removers.
Scientific Evidence Supporting Borax’s Ability to Kill Mold
Studies have shown that borax effectively kills various types of mold. Its fungicidal properties have been documented in scientific research, confirming its use as a natural method for mold remediation.
Borax’s action against mold has been observed not just in laboratory settings but also in real-world applications.
Practical Steps to Use Borax for Mold Removal
To use borax for mold removal, mix a solution of one cup of borax per gallon of water. Apply this solution to the affected area without rinsing.
Scrub the moldy surface with the solution until the mold is removed. Afterward, wipe the surface clean and let it dry completely to prevent mold from returning.
Safety and Precautions When Using Borax

Potential Health and Safety Concerns With Borax
While borax is safer than many chemical cleaners, it can still pose health risks if not handled properly.
Ingesting borax can be harmful, and prolonged contact with skin can cause irritation. Always use gloves when working with borax and keep it out of reach of children and pets.
Proper Handling and Usage Guidelines for Borax
When using borax, wear protective gloves and avoid inhaling the dust. Mix borax with water in a well-ventilated area to minimize inhalation risks.
Do not use borax on food-preparation surfaces, and store the substance in a secure location away from children and pets.
Environmental Considerations When Using Borax for Mold Treatment
Borax is a naturally occurring substance, but it should still be used responsibly to minimize environmental impact.
Avoid using borax in excess and releasing large quantities into the environment, particularly into waterways, as it can disrupt aquatic ecosystems. Disposing of borax solutions should be done according to local regulations.
Alternative Mold Removal Options for Those Concerned With Borax Safety
For those who prefer not to use borax, alternative mold removal options include vinegar, baking soda, and hydrogen peroxide.
These natural substances also have mold-killing properties and can be used safely in homes for effective mold remediation. Always research and follow proper guidelines when using any mold removal product.
FAQs About Borax and Mold
Can borax effectively kill mold?
Yes, borax can effectively kill mold as it is a natural fungicide that prevents mold growth and can remove existing mold.
How do you use borax to treat mold?
To treat mold with borax, mix a solution of borax and water, apply it to the moldy area, and then scrub the surface to remove the mold.
Is borax safe to use for mold removal?
Borax is considered safe for mold removal as it is a natural cleaning agent, but it should be used with caution and proper protective equipment.
What is the recommended borax to water ratio for mold treatment?
A common borax to water ratio for mold treatment is one cup of borax to one gallon of water.
Does borax prevent mold from coming back?
Borax can inhibit future mold growth, but for long-term prevention, it’s essential to address the underlying moisture issues that contribute to mold.
Final Thoughts
Borax serves as an effective natural fungicide and cleaning agent against mold. By creating and applying a solution of borax and water, one can both prevent and eliminate mold growth.
Its use involves scrubbing the mixture onto the moldy surfaces to address infestations.