How to Remove Exterior Mildew Stains

Image demonstrating mildew removal from exterior siding.

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 Tools & 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.

TIP: 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.

TIP: 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.