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Question DetailsAsked on 9/17/2013

How do I clean moldy trim on my house exterior so I can paint the trim and not have mold return.

My porch wood trim has black surface mold. I want to paint it white, but need to get rid of the mold first. I was going to wash it with Clorox and Simple Green cleaning solution and rinse it well with water. Is there anything I can do to keep the mold from coming back next year, ie. a paint additive or surface prep I can use for this purpose.

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2 Answers


Mold exists in the environment naturally. So you always run the risk of growing mold on the exterior of the home, especially on the north side and the morning sun side. This is a common issue for many home owners.

The most effective way to clean before painting is power washing with a mild detergent. This will kill the mold.

There are anti fungal additives you can add to the paint. Normally, there are little anti fungal packets at the paint counter and if you have a color mixed in, they will normally add the anti fungal agent to it for you. If not, simply add the appropriate amount (read the instructions on the packet) for the amount of paint you are using and paint the home. Once painted, you shouldn't see mold growth in those areas again, or at least not as much, as often. Regular cleaning may still be required, but should be required less if the paint is mold resistant.

Answered 4 years ago by Fungi


Power washing with detergent will NOT kill mold - you should first kill the mold with a mildewcide/antifungal especially designed for siding, wait the specified number of hours or days for it to work, then powerwash with detergent, rinse, dry, then prime with an antifungal paint like Kilz Premium Primer, then 2 topcoats of an appropriate finish paint with added mildewcide packets. Beware if you are using a very light color - some mildewcides discolor whites and cremes. A satin or semi-gloss finish will resist mold longer than a house flat or low-sheen or eggshell finish.

Answered 4 years ago by LCD

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