Menu Close

Removing Mildew from a Cedar Deck

How do you remove mildew from new cedar deck boards? Some of them were just installed. I can’t believe mildew would appear that fast! I would like to seal the deck, however I can’t do it until the mildew is removed. Thanks.



You can remove mildew from a wooden deck with any deck cleaner. You can also use a product called JOMAX – it’s a great cleaner that you mix with water and laundry bleach. Spray it on, let it soak for 15 min, then hose it off. Scrub if any residue remains.

The mildew was probably on the lumber when it was installed, and was activated by the exterior moisture. Cleaning will help remove the dirt that the mildew loves to grow on. You do need to seal the deck soon, as it is dry in the spring.