Mold or fungi is a common household issue that can cause various health problems and structural damage if not addressed promptly. Among the many proposed solutions, Clorox bleach is often a go-to remedy. But does Clorox kill mold effectively? In this blog, we’ll explore this question in depth, providing insights into how Clorox works against mold, its effectiveness, and alternative solutions for mold remediation.

Understanding Mold And Its Risks

Mold is a fungus that flourishes in humid, warm conditions and can colonize walls, ceilings, fabrics, window sills, and wood. Mold exposure can result in respiratory complications, allergies, and other health issues, underscoring the importance of promptly addressing mold infestations.

How Does Clorox Bleach Work?

clorox bleach

Clorox bleach is a powerful disinfectant and stain remover. It contains sodium hypochlorite, which can kill bacteria, viruses, and fungi on non-porous surfaces. When applied to mold, Clorox can help to remove the visible stains and kill the mold on the surface.

Steps To Safely Remove Mold With Clorox

remove mold with clorox

Following the steps below, you can effectively use Clorox to tackle mold in your home while ensuring safety and thoroughness. Always wear protective gloves and old clothing during the process; proper ventilation is crucial to prevent inhaling fumes and aid in drying the area.

Prepare The Area

Start by opening windows to ventilate the area. This ensures fresh air circulation and helps disperse any fumes from cleaning.

Pre-Clean The Surface

If there is heavy mold or mildew, wipe away as much as possible before applying the bleach solution. This makes the treatment more effective.

Mix The Bleach Solution

Combine ⅓ cup of Clorox Disinfecting Bleach with one gallon of water. This ratio provides an effective concentration for killing mold.

Apply The Solution

Wear protective gloves and apply the bleach solution to the mold-affected area using a sponge or brush. For convenience, a spray bottle can also be used.

Wait For 10-15 Minutes

Let the Clorox bleach solution sit on the mold for 10 minutes. Reapply the solution as needed to keep the surface wet during this time.

Rinse Thoroughly

After 10-15 minutes, rinse the treated area with clean water to remove bleach residue.

Allow To Air Dry

Let the area air dry completely. Using a fan or opening home windows can speed up the drying process. Ensure the spray bottle is thoroughly rinsed after use.

The Effectiveness Of Clorox Bleach On Mold

While Clorox bleach can effectively kill mold on non-porous surfaces like tiles and bathtubs, its effectiveness on porous materials is limited. Here’s why:

  1. Surface Penetration: Mold often grows deep into porous materials like wood, drywall, and fabrics. Bleach cannot penetrate these materials deeply enough to kill the mold roots, leading to potential regrowth.
  2. Temporary Solution: Bleach can remove mold’s surface appearance, but it doesn’t address the underlying moisture problem that caused mold growth in the first place. Without resolving the moisture issue, mold is likely to return.
  3. Health Risks: Using bleach releases toxic fumes that irritate the eyes, skin, and respiratory system. In poorly ventilated areas, this can pose significant health risks.

Alternatives To Clorox For Mold Remediation

For safer mold removal, avoid using Clorox bleach due to its limitations and potential risks. Instead, consider using alternative methods.

  1. Hydrogen Peroxide: A safer and equally effective alternative, hydrogen peroxide can penetrate porous materials and kill mold at the roots. It also doesn’t release toxic fumes.
  2. Vinegar: White vinegar is another natural mold killer. It can be sprayed directly onto moldy surfaces and left to sit for an hour before wiping clean. Vinegar is non-toxic and effective for both porous and non-porous surfaces.
  3. Baking Soda: Baking soda can be used with vinegar or alone to clean mold. It kills mold and absorbs moisture, helping to prevent future growth.
  4. Commercial Mold Removers: Various EPA-approved mold removal products are designed to kill mold and prevent regrowth. These products are often more effective and safer than using bleach.

Professional Mold Remediation

mold remediation

For large or persistent mold problems, it’s best to seek professional help like Mold Assassins. Certified mold remediation specialists possess the knowledge and specialized tools to safely and efficiently eliminate mold from residential settings. Additionally, they can offer sustainable strategies to deter future mold infestations.

Mold Prevention Tips

To prevent mold or fungi from returning, follow these tips:

  1. Control Humidity: Keep your house’s indoor humidity levels below 50% using dehumidifiers and air conditioners.
  2. Improve Ventilation: Use exhaust fans or keep some areas open in kitchens and bathrooms to improve air ventilation and ensure proper ventilation in all rooms.
  3. Fix Leaks Promptly: Fix every leakage point in roofs, walls, or plumbing as soon as they are caught.
  4. Keep Surfaces Dry: Wipe down wet surfaces and dry wet items immediately to prevent mold growth.
  5. Use Mold-Resistant Products: Consider mold-resistant drywall, paint, and insulation in moisture-prone areas.


While Clorox bleach can temporarily kill mold on non-porous surfaces, it is not the most effective or safest method for comprehensive mold remediation. Consider using alternative methods like hydrogen peroxide, vinegar, and commercial mold removers for lasting results. Addressing the underlying moisture issues and following prevention tips are key to keeping your home mold-free. If in doubt, consult professional mold remediation services to ensure the job is done safely and thoroughly.