How To Get Rid Of Mildew On Exterior Walls?


To remove mildew from wood siding, hardi-plan, or stucco, use the following solution:

  1. 1/3 cup all-purpose laundry detergent.
  2. 1 quart household chlorine bleach (must be fresh)
  3. 3 quarts warm water.
  4. An alkaline cleaner such as washing soda or a cleaner containing trisodium phosphate can be added for extra cleaning.


Spray away mildew starting at the top of an exterior wall, and work your way downward. In many cases, the mildew will spray right off. If you run into stubborn mildew accumulations, though, use the stiff adjustable brush on the end of the PivotPro wand.

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Frequently Asked Questions

Why do I have mould and mildew on my walls?

What are mould and mildew and why do they occur on walls? Mould is a kind of fungus that develops from airborne spores. It usually grows in damp, warm conditions without much airflow, which is why household bathrooms and loft spaces often suffer from mould.

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