How to Get Rid of Mold on Concrete

Moldy concrete
Moldy concrete (Image: concrete image by Empath from

Mold discolors concrete, and mold spores seep into the concrete below the surface due to the porous nature of concrete. A light cleaning of the concrete surface will not remove all of the mold, meaning improperly cleaned moldy concrete remains a health threat to people and animals. To get rid of mold on concrete, clean the concrete with a general cleaning solution followed a heavy coating of mold-killing cleanser.

Things You'll Need

  • Goggles
  • Rubber gloves
  • Rubber boots
  • Face mask
  • 2 Tbsp. dish detergent
  • Hot water
  • Bucket
  • Mop
  • 1 cup bleach
  • Broom
  • Fan (optional)

Video of the Day

Put on protective gear to keep mold spores off of your hands and feet and out of your eyes and airways.

Hoses on concrete
Hoses on concrete (Image: hoses on concrete image by pearlguy from

Pour 2 Tbsp. dish detergent and hot water in a bucket, and mix them gently with the mop.

Protective gear is important when cleaning mold from concrete.
Protective gear is important when cleaning mold from concrete. (Image: rubber gloves image by AGphotographer from

Saturate the floor with the mop. Do not wring the mop when you lift it out of the soapy water. Mop up the excess water after saturating the floor. Dump the dirty water after mopping. Dry mold spores become airborne when moved, so wetting the concrete thoroughly is important for your health.

Pour 1 cup bleach and 1 gallon of hot water into the bucket. Pour about a cup of the mixture on the concrete and scrub it in with the broom bristles. Add more bleach water when the area starts to look dry. Continue soaking and scrubbing until the entire surface is soaked with bleach.

Mop up the excess bleach water and expose the concrete to circulating air either by opening doors and windows or setting a fan to blow on it. You do not need to rinse the bleach water away.

Tips & Warnings

  • Do not use a sponge mop for the step with the bleach water, because bleach often reacts with sponges, causing them to break down and fall apart.


Promoted By Zergnet

You May Also Like

Is DIY in your DNA? Become part of our maker community.