How to Remove Mold and Mildew from Concrete

Before applying a concrete sealer, the surface must be free of all mold and mildew. Below are a few processes on how to remove mold and mildew from concrete. We recommend using a facemask and rubber gloves in order to avoid inhaling the mold and mildew.

How to remove mold and mildew from concrete

  • Use household bleach, one cup bleach to 1 gallon of water.


  • Mix 1 cup of vinegar with 2/3 cups of water in a sprayer bottle. In order to treat a larger surface double, triple, or quadruple the ratio and use a low pressure sprayer. Spray the mixture directly on the mold and mildew and wait 30 minutes. After 30 minutes, spray more and scrub gently with a sponge. You should begin to see the mold and mildew scrub off. If there is still additional mold and mildew, spray with the vinegar/water mixture and wait another 30 minutes before scrubbing and wiping away the mold and mildew.

After moving all existing mold and mildew apply a penetrating concrete sealer to reduce future mold and mildew growth.

Why Ghostshield?

By using a penetrating concrete sealer like the SILXOA-TEK 8500 mold, mildew and organic growth will be reduced and made easier to clean. The Siloxa-Tek 8500 is our favorite product to treat nearly any application. A proprietary blend of silane/siloxanes, this clear penetrating sealer not only prevents deicing salt and freeze-thaw damage, but its hydrophobic nature resists moisture intrusion and vapor transmission. This is the go to choice to seal any concrete, brick, or masonry based substrate especially driveways, basements, patios and garages.

Siloxa-Tek 8500

Penetrating water & salt repel

Published Friday 22nd of November 2013 // Updated Wednesday 15th of August 2018

Find More Concrete Sealer Products by Ghostshield

Product Finder

Find your product

Not sure which of our products best fits the needs of your project? Answer questions about your specific application for a product recommendation.