Removing mildew from drywall

Although removing mildew from drywall may seem like a hard job, in fact it it quite easy. There are different methods to remove mildew and also very simple and effective.

Tools and Materials

  • Clorox solution
  • Stain Blocker Primer
  • Cleaning Sponge
  • Dry cloth
  • Keyhole saw
  • Scrap piece of drywall sheet
  • Wooden board
  • Wallboard joint compound glue
  • Flathead screws & screwdriver
  • Gloves & Protective Goggles


You will need to assess the damage done by the mildew.

It’s best to see if the mildew is only on the surface of the drywall or if it has penetrated the trusses.

For making the solution you can use equal parts of Clorox and water. Always use protective gloves and eye goggles. Use a sponge and apply the solution on the affected area. Scrub the area. Always make sure to clean the sponge after a wipe, to prevent spreading the stains. Also the sponge needs not to be saturated with solution. This will prevent water from infiltrating in the wall.

Dry the surface as good as you can.

Removing rotten areas

After the cleaning, wait a few days to see if the mold reappears. If it does, then the problem is more complicated. It means that the mildew has penetrated deeper in the wall. In this case you will need to remove the rotten area and replace it.

Mark the rotten area and the use a keyhole saw to cut it. You will then need to cut an identical piece and replace the one that you’ve removed.


For the freshly replaced area, you can use some mildew resistant and watertight solution that will prevent mildew from reappearing. Use some joint compound to cover the joints. Prime the area and repaint it.

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