Do Bleach and Peroxide Actually Kill Mold?

The Bleach Myth

One of the most common misconceptions about mold removal is that bleach kills mold. While bleach can remove surface mold stains, it's actually ineffective at killing mold on porous surfaces like wood, drywall, and grout — which is where most household mold grows.

In fact, the EPA does not recommend using bleach for mold remediation. Here's why.

Why Bleach Doesn't Work

• Bleach only removes color from surface mold, giving the illusion of removal
• It cannot penetrate porous materials where mold roots grow
• The water content in bleach can actually feed remaining mold spores
• Mold often returns within weeks of bleach treatment
• Bleach fumes can be harmful, especially in enclosed spaces

What About Hydrogen Peroxide?

Hydrogen peroxide is a better option than bleach for small surface mold, as it has antifungal properties and can penetrate porous surfaces to some degree. However, for any significant mold growth, professional remediation is the only reliable solution.

"We get calls every week from homeowners who tried bleach first and watched the mold come back worse than before. Bleach treats the symptom, not the cause."

The Professional Approach

Professional mold remediation addresses the root cause — moisture — and uses containment, HEPA filtration, and commercial-grade antimicrobial products that actually kill mold at the cellular level. It's not just about what you can see.