How To Remove Mold And Mildew From Concrete

Request A Free Consultation

Why Mold Thrives on Concrete?

Concrete, a porous material, is an ideal breeding ground for mold and mildew. The key factor in this is moisture. When moisture seeps into the tiny pores of a concrete surface, it creates a conducive environment for mold spores to settle and grow, especially in shaded and damp areas. Understanding this information is important as it makes you more cautious about moisture-prone areas like outdoor concrete basement floors and concrete walls that are exposed to limited sunlight.

Advantages of Removing Mold and Mildew from Concrete
Removing Mold And Mildew From Concrete

What are the Health Risks of a Mold Infection?

Mold spores generally cause various health issues, especially for those with allergies, respiratory problems, or weakened immune systems. Toxic black mold, in particular, is known for its severe health risks. So, fixing a mold problem as soon as it’s detected is a must-do for maintaining a healthy living environment.

Preparing to Clean Mold from Concrete Surfaces

Let’s learn about the important steps you should follow to clean mold from concrete surfaces on your property, whether indoors or outdoors.

Gather Your Supplies

Before you start, make sure you have the following supplies available:

  • Protective gear (gloves, goggles, mask) to protect you from mold spores and cleaning chemicals.
  • A high-quality pressure washer or power washer.
  • Mold-killing detergent.
  • A stiff-bristle brush or scrub brush.
  • A bleach solution (1 cup of bleach, which should be mixed with 1 gallon of water).
  • A bucket and sponge.
  • Plastic sheeting and tape (for indoor areas)

It is always recommended to hire a professional pressure washing company to remove mold and mildew from concrete surfaces. Professionals pressure washers have the experience and expertise to effectively clean different types of surfaces. Additionally, pressure washing requires training and knowledge of safety measures, and professionals know how to use the equipment safely and efficiently. Therefore, it’s best to avoid pressure washing on your own and always hire a professional pressure washing company for this job.

Keep Your Safety First & Wear Protective Gear

Cleaning mold properly can release mold spores into the air, which are harmful if inhaled or come into contact with your eyes or skin. Therefore, you should always wear protective gear, including gloves, goggles, and a mask, to protect yourself while cleaning mold from concrete surfaces.

Pressure Washing Concrete Surfaces

Call Us For a Free Initial Consultation

We Are Here To Assist You, Contact us today for more information.

Step-by-Step Guide to Remove Mold and Mildew from Concrete

After ensuring your safety, we can now discuss every step in detail for removing mold and mildew from concrete surfaces. Let’s learn:

Clear & Prepare the Area You Want to Pressure Wash

The first step is to clear and prepare the area you want to wash. Remove any plants, furniture, or other items from the area for outdoor concrete surfaces. If you want to clean indoor areas like basement floors, cover nearby items with plastic sheeting and tape to protect them from mold spores and cleaning solutions.

Prepare Concrete Area For Pressure Wash

Pre-Clean the Concrete Surface

Now, use a stiff-bristle brush to scrub away loose mold and mildew from the concrete surface. This scrubbing will remove surface-level mold and allow the cleaning solutions to penetrate deeper into the pores of the concrete.

Apply a Bleach Solution

After the pre-cleaning is done, mix a bleach solution by combining 1 cup of bleach with 1 gallon of water. Pour the cleaning solution into a bucket or spray bottle.

Now, you can generously apply the bleach solution to the moldy concrete surface, ensuring that all areas with mold and mildew are thoroughly soaked. Let the solution sit for 15 minutes to kill mold spores and loosen the mold.

Scrub the Concrete Surface

The next step is to use a stiff-bristle brush to scrub the concrete surface. This step might require some elbow grease, as you need to scrub vigorously to remove all the mildew and mold embedded in the pores of the concrete surface. For stubborn mold spots, you have to apply more bleach solution and continue scrubbing.

Rinse the Area with a Pressure Washer

Using a pressure washer, thoroughly rinse the concrete surface to remove the bleach solution and dislodged mold. You should rinse all areas, including cracks and crevices, to ensure the removal of all mold and cleaning solution. 

If a pressure washer is not available, you can use a garden hose with a high-pressure nozzle, but it is recommended to hire a professional pressure washing company for this task as they will clean mold and mildew from the concrete surfaces in the best way, ensuring the safety of your home and belongings.

Pre-Clean The Concrete Surface

Apply a Mold-Killing Detergent

For more protection against future mold growth, it is recommended to apply a good mold-killing detergent to the clean concrete surface. Follow the instructions given by the manufacturer to get the best results. This is especially important for areas that are prone to moisture, such as exterior concrete surfaces and basement floors.

Allow the Concrete to Dry

In the last step, allow the concrete surface to dry completely. Mold grows in damp environments, so confirming that the area is dry helps prevent new mold spores from settling and growing. If possible, increase ventilation in indoor areas or use fans to speed up the drying process. Prioritize your safety throughout the pressure washing process.

Bleach Solution For Concrete Cleaning

Preventing Mold & Mildew on Concrete Surfaces

Let’s discuss how to prevent mold and mildew on concrete surfaces.

Regular Cleaning & Maintenance

Regularly clean your concrete surfaces, whether indoors or outdoors, to prevent mold growth. Sweep and wash outdoor concrete surfaces to remove dirt and debris that can trap moisture. If you have concrete surfaces inside your property, then maintain a clean and dry environment to prevent mold growth.

Control Moisture Levels

Controlling moisture levels is a game changer in preventing mold infestation. To reduce humidity, you can use dehumidifiers in damp areas like basements. Also, make sure that there is proper drainage around your home to prevent water from pooling on exterior concrete floors.

Seal Concrete Surfaces

It is suggested that concrete surfaces be sealed with a high-quality concrete sealer. Sealing products are easily available on the market and online, and they are a barrier that prevents moisture from penetrating the porous concrete, reducing mold growth.

Preventing Mold & Mildew On Concrete Surfaces

When to Call a Professional Pressure Washer?

If you have a serious mold or mildew problem or you are dealing with toxic black mold, it may be best to call a professional pressure washing company. Professionals have the expertise and equipment to safely remove all the mold, ensuring your home or commercial property is safe and mold-free.

Professional pressure washing service providers can easily assess the extent of mold infestation and recommend the best course of action. They also provide preventive measures to help keep mold from returning.


Cleaning mold and mildew from concrete surfaces requires an approach to remove all mold and prevent future growth. By following the steps outlined above, you can clean mold from outdoor concrete surfaces, concrete walls, and basement floors. Always remember to wear protective gear, use the right cleaning solutions, and maintain a dry environment in your home or office to keep mold at bay. With regular maintenance, you can keep concrete surfaces clean and free from mold.

Call Chris’s Pressure Washing To Remove Mold & Mildew from Concrete

Are mold and mildew taking over the concrete surfaces of your home or commercial property? Don’t worry! Get ready for a sparkling transformation with Chris’s Pressure Washing! Our team specializes in banishing mold and mildew and offers a dazzling array of services to make your property shine.

From leaf removal and gutter cleaning to low-pressure house cleaning, roof cleaning, and professional window cleaning, you can count on us. Say goodbye to rust, stain, and graffiti with our services, and watch as we work magic on concrete decks, fences, and driveways. Whether you’re a commercial or residential client, we’re here to make your property gleam. Contact us today! 

About Company

At Chris’s Pressure Washing Pressure we understand that you have many other things to focus on than parking lots and driveways. 


Chris's Pressure Washing, Pressure Washing, Church Hill, TN