How to Remove Mold and Mildew from Concrete

Published Friday 22nd of November 2013 // Updated Wednesday 20th of September 2017

Topics: diy, how to

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.

  • Purchase Hydro-Etch 1000 which is a powerful, acid-based cleaner, specifically formulated to clean, brighten and etch concrete in addition to removing efflorescence and excess concrete residue.
  • 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.
  • Always neutralize the surface and make sure the surface is dry before applying a Ghostshield concrete sealer.

Hydro-Etch 1000

Acid etch & cleaner

Tags: acid-based cleaner, concrete cleaner, concrete protection, concrete sealer, diy, efflorescence removal, hydro-etch 1000, organic growth removal

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