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See all Exterior paint how-to »

How to Remove Exterior Mildew Stains

Skill:  Intermediate DIY'er

Make sure to remove any mildew stains before you paint your home's exterior.

For Best Results:

Make sure to dampen the areas to be cleaned prior to applying the cleaning solution

Allow sufficient time for the cleaning solution to work (10 - 15 minutes).


Suggested Supplies

  • Bucket
  • Hose
  • Ladder
  • Pressure Washer
  • Protective Apparel
  • Pump Sprayer
  • Rags
  • Scrub Brush
Step 1

Using a garden hose or a pressure washer, wet the mildewed area with water.

Step 2

Using a pump sprayer, apply BEHR PREMIUM® All-In-One Wood Cleaner to the mildewed area.

Prior to applying the cleaning product, dampen the surrounding grass, plants, and other vegetation with water.
Step 3

Reapply the cleaner as needed to keep the surface wet. Allow the solution to remain on the surface for 10-15 minutes. Scrubbing may be required on severely stained surfaces.

Step 4

Thoroughly rinse the surface with water. Allow it to dry.

For non-painted wood or new wood, apply BEHR PREMIUM All-in-One Wood Cleaner to the wet, rinsed, treated surface. Do not allow the surface to dry prior to applying the product.