Many homeowners believe that bleach is the best solution for killing mold, but the truth is—it does not work. While bleach may remove surface stains, it does not eliminate mold at its root, and in some cases, it can even make the problem worse.
In this article, we will explain why bleach is ineffective, the risks of using it for mold removal, and the best alternatives for safe and permanent mold remediation.
Why Bleach Doesn’t Kill Mold
1. Bleach Only Affects the Surface
Bleach is a strong disinfectant, but it does not penetrate porous materials like drywall, wood, or carpet—where mold often grows. Instead, it only removes visible mold on the surface, while the roots (hyphae) remain intact and continue to spread.
2. Bleach Can Make Mold Worse
Many people do not realize that bleach contains a high percentage of water. When applied to mold-infested surfaces, the chlorine in bleach evaporates quickly, leaving behind moisture that mold thrives on. This can actually stimulate further mold growth rather than stopping it.
3. Bleach Does Not Kill Airborne Mold Spores
Mold reproduces by releasing microscopic spores into the air. Bleach has no effect on airborne spores, meaning that even if you wipe away visible mold, spores can still travel and cause new mold growth in other areas of your home.
4. Bleach is Toxic and Harsh
Bleach produces strong fumes that can cause:
Eye, nose, and throat irritation
Respiratory issues, especially for people with asthma
Skin burns and chemical exposure risks
Mixing bleach with other household cleaners—especially ammonia—can create dangerous toxic gases.
The Right Way to Get Rid of Mold
1. Identify and Eliminate the Moisture Source
Mold will always return if the underlying moisture problem is not addressed. Inspect for:
Leaks in plumbing, roofs, or walls
Poor ventilation in bathrooms and kitchens
High humidity levels (above 50%)
Fixing water damage and reducing indoor humidity is the first step in preventing mold growth.
2. Use Professional Mold Removal Solutions
Instead of bleach, professionals use EPA-approved antimicrobial treatments that:
Kill mold at its root
Prevent regrowth
Are safe for your home and family
One of the most effective solutions is Chlorine Dioxide (ClO₂), which penetrates deep into porous materials to eliminate mold at its source.
3. Schedule Professional Mold Remediation
Mold can be dangerous if not removed properly. A professional mold remediation company will:
Conduct a thorough mold inspection
Use advanced technology, such as Instascope, to detect airborne mold
Remove mold safely with HEPA filtration and containment methods
Prevent future mold growth with long-term moisture control solutions
Can You Use Bleach for Small Mold Problems?
If the mold is only on a non-porous surface (like glass, metal, or tile), bleach may temporarily remove it. However, mold on drywall, wood, carpets, or ceilings should never be treated with bleach.
When in doubt, always call a professional mold remediation expert.
When to Call MoldPros
You have recurring mold growth, even after cleaning.
Mold is growing on walls, ceilings, carpets, or wood.
There is a musty smell in your home, but you cannot see the mold.
You or your family are experiencing allergy symptoms, headaches, or respiratory issues indoors.
At MoldPros, we specialize in mold testing, safe remediation, and long-term prevention. Our advanced Instascope technology allows us to detect airborne mold in real time, so we can provide a fast and effective solution.
Don’t waste time with bleach—eliminate mold for good.
Call us today for a mold inspection: 412-628-3011
Visit us online: www.westpamoldpros.com
Serving Pittsburgh & Western PA
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