How To Clean Mold Off Cinder Block Walls? 6 Easy To Follow Steps For You!

Helen Skeates
Helen Skeates
13 min read

Despite their durability, cinder block walls are susceptible to issues like mold growth. To learn how to remove mold from cinder block walls, keep reading.

Mold spores emerge and grow on cinder block walls when dirt and moisture collect and settle on them. As soon as you notice mold patches on your walls, it is imperative that you take action promptly.

Method 1: How to Remove Mold from Concrete Block Walls

Pre-Step: Remove the source of the moisture

Before you start, you have to remove the cause of the mold first. That is the source of the water that is causing the mold to grow.

6 Easy Steps On How To Clean Mold Off Cinder Block Walls - Krostrade

Fix the plumbing problem if it is due to a leaky pipe. Make sure your sump pump is working and that the space is completely dry with a fan if there was a flood. Silicone caulk can be used to repair leaks around window sills and the foundation if necessary.

It can also be induced by a high amount of humidity above 55%. As a result, condensation and water damage will occur. To address this problem, you’ll need a dehumidifier with a continuous drain.

1. Gather Equipment and Prep for Safety

Your cleaning and safety gear should be gathered first.

Those who are sensitive to mold may get asthma and other allergic symptoms as a result of exposure. Avoiding this activity is preferable for those persons.

Protective Gear

Gloves, a N95 dust mask, and safety glasses are all necessary pieces of safety gear.

Mold spores can get on your clothing, so wear a Tyvex suit to keep them from contaminating your clothing.

The Equipment You’ll Need to Remove Mold

  • A scrub brush is used to remove dirt and grime
  • The best spray bottle for the job.
  • Dishwashing liquid from Dawn
  • RMR-86, OxiClean, or Hydrogen peroxide sanitizers, for example
  • shop vacuum with a HEPA filtration system

The mold can be cleaned with a variety of different products.

When it comes to general cleaning, hydrogen peroxide or OxiClean can be used. Use a scrub brush to get the dirt out of the carpet.

If you want a thorough cleaning, you can use the same products that the pros use. This formula does not need to be scrubbed.

The RMR-86 spray bottle can be used for tiny moldy areas.

The 2.5 gallon quantity can be used with a garden pump sprayer or a professional spray bottle for large moldy areas.

2. Vacuum the Excess Mold

To begin with, you need to get rid of the surplus mold.

You can use a HEPA vacuum attachment to remove the mold. Mold spores as fine as 0.3 microns can only be captured by a HEPA-rated filter.

3. Spray down the moldy concrete

Next, with a cleaner of your choice, such as Oxiclean or RMR-86, spray down the moldy areas. Don’t skimp on the water.

Spray the moldy spots with a cleaner of your choice, such as Oxiclean or RMR-86, before proceeding. Give it plenty of water.

4. Rinse with cloth and clean water

To remove dirt and grime off indoor concrete blocks, wet a cloth with clean water and wring it out.

5. Dry

Wait at least 24 hours for the surface to dry completely.

Fans and dehumidifiers are two possible solutions.

How to Get Rid of Mold on Concrete Block Walls - Step by Step Guide

Method 2: Steps to Remove Mold on Concrete Block Walls with Bleach

Step 1: Gather the required tools and materials

To get rid of the mold spores present in the air of the room or basement, run a HEPA air filter for 4-7 days. The residual mold spores in the air will be removed as a result of this procedure.

Step 2: Take safety precautions

Run a HEPA air filter for 4-7 days to remove mold spores from the air in the room or basement. Any mold spores that are still in the air will be destroyed by this method.

Mold removal should never be attempted with your bare hands. Put on gloves and safety gear before beginning work.

Wearing safety goggles will safeguard your eyes.

You should always wear a N95-rated mask or a respirator when cleaning mold if you have asthma.

Step 3: Identify mold

Observation might be difficult to tell the difference between mold and mineral deposits.

Dark spots and hairy-looking things are typical of mold. Take a spray bottle and fill it with water to be on the safe side.

Then use a spray bottle to apply it to the desired areas. Minerals are formed when the elements are combined and dissolved.

Black mold will grow if nothing is done. Proceed to the following stage after taking note of the problematic regions.

Step 4: Scrub the mold with a mixture of water and bleach

As a result, you’re probably wondering, “What kills mold?” Is bleach an effective tool for eradicating mold? Using bleach is the best way to get rid of mold. Only bleach may not be sufficient in some cases, however.

When you’re ready to use the mixture, add the bleach to a gallon of water. After that, use a scour brush to remove the mold.

Wear safety glasses to protect your eyes from any scrubbing splashes.

Clean the concrete wall by dipping a scrub brush into the mold. After the mold has been removed, you must thoroughly clean the area.

Step 5: Let the concrete dry

Let the area dry for 24 hours once you’ve finished cleaning.

Fans and dehumidifiers are two possible solutions.

Mold thrives in the presence of water, and it grows swiftly. As a result, maintaining a dry environment is essential.

If you don’t remove the mold, it will return in a matter of days. If the concrete wall doesn’t get enough ventilation, use a dehumidifier. Alternatively, you might utilize a fan directed at the wall.

Step 6: Prevent mold from growing again

The mold will return in a matter of days if you don’t remove it now. A dehumidifier can be used if the concrete wall does not receive enough airflow. You can also use a fan and direct it at the wall.

Alternatively, mold-resistant paint can be applied to the surface.

There is a good chance that they can assist you avoid the re-emergence of mold.

How to Get Rid of Mold on Basement Walls

Mold removal from your home’s surfaces can be done in a variety of ways, depending on the location of the mold and the size of the area. Most mold removal supplies can be purchased at your local home improvement or hardware store if you don’t need a professional to deal with serious mold infestations.

To begin with, you should hire an inspector or do some research to determine what kind of mold or mildew you’re dealing with, as some organic materials are more hazardous than others. Otherwise, killing mold in a 10″ × 10″ or smaller area is a straightforward operation that doesn’t require much effort or time.

Mold removal from wood differs from mold removal from concrete, so pay attention to the foundation material before applying a cleaning solution. Cleaning painted walls properly necessitates more attention to detail. Mold and mildew removal should be done carefully so as not to damage the surface.

How to Remove Mold From Concrete - Cleaning Tips - Concrete Network

How to Clean Mold from Concrete Basement Walls with Hydrogen Peroxide

One of the most versatile and powerful cleaners, hydrogen peroxide can be used to disinfect surfaces as well as to kill bacteria. Peroxide can be used in a variety of ways around the house, both indoors and outdoors.

Using hydrogen peroxide to disinfect your basement walls will kill everything growing on them, including mold! Concrete basement floors also benefit greatly from this kind of cleaning.

As if cleaning mold from concrete basement walls wasn’t complicated enough, here’s how to get started with this concrete cleaner:

Hydrogen Peroxide Method

  • H2O2 with a concentration of 3%
  • a mist wand
  • Brush with hairs

Adding 3 percent hydrogen peroxide to a spray bottle is a great way to get rid of mold and mildew on concrete basement walls. Allow the peroxide to soak into the walls for up to 30 minutes. After ten minutes of scrubbing, remove any remaining mold from the concrete pores by using a bristle brush to remove it from the wall.

As a last step after you’re done, spray the walls with a hose or scrape them with warm water to eliminate any lingering spores. Remove any remaining water from the surface with a dry towel to prevent the growth of more mold.

Peroxide is a good choice for removing mold and mildew as well as other forms of stains, especially when it comes to how to clean white walls.

If you’re painting a wall, peroxide can also be used to clean the surface before applying the paint. Keep a few bottles on hand for cleaning and therapeutic purposes.

Cleaning Mold From A Painted Wall With No Water Damage

To begin the process of removing mold from walls or ceilings, it is imperative that you take all necessary precautions to ensure your safety.

Mold may not affect everyone, but even low levels of mold exposure can cause allergic reactions in some people.

Individuals such as babies, the elderly, those with weakened immune systems, and those with long-term respiratory issues.

Even if the mold in your home is only a little amount, you should take the appropriate safety precautions before cleaning it. Do not forget to protect your hands and eyes by using a N95 mask and gloves.

Do a visual assessment to see how much of the wall has been affected by the moisture problem after you remedy it.

Things You’ll want to bring:.

  • Bucket
  • Cleaner in a bottle (like Dawn)
  • the use of a scrub brush
  • Using a HEPA-filter vacuum cleaner
  • Gloves
  • Respirator with N95 Level of Protection
  • Fans and/or dehumidifiers
  • Eye safety is provided with goggles.
  • Clothes are ready to be washed.

Mold development on the surface of walls and ceilings can be removed with this technique.

Mold and moisture-damaged drywall and components should not be used in these regions.

Put on your gloves, mask, and eye protection before you begin.

  1. Ventilation can be achieved by opening windows.
  2. Vacuum the surface with a HEPA-filtered vacuum to eliminate any mold spores that may be on it. Mold spores, for example, can be captured by HEPA vacuums’ filters, which are capable of collecting incredibly minute particles. Mold spores will no longer be able to spread via the air.
  3. The detergent can be applied on the brush or directly to the surface once the wall has been vacuumed.
  4. Start scrubbing the affected region. It will take longer to dry the wall if it is not oversaturated.
  5. After removing the molds from the surface, use a cloth to dry the area.
  6. Cleaning the area with sanitizers like Lysol disinfecting wipes is an additional step you might take. This aids in the eradication of any spores that may still be present on the wall.
  7. Paper towels or cloths can be used to re-dry the area. At this point, it is usual to see minor stains on the wall’s surface.
  8. Dry the area by positioning a fan next to a wall and allowing it to circulate the air. As a result, the wall will be dry and free of cleaning-related dampness.
  9. Observe the area for 24 hours and repeat if necessary.
  10. Even after drying, some stains will remain. Re-painting the wall is an option at this time. If the initial source of moisture is fixed, the molds will not reappear.


Your family’s health could be at risk if mold grows in your house. Investing in prevention is the greatest way to avoid it as much as possible.

Your home’s sparkling appearance is now within your reach thanks to your knowledge of how to remove mold from cinder block walls. No need to go out of your way to protect your home from potential dangers. You can refer to this post at any time if you need any guidance.

Helen Skeates

Helen Skeates

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