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I am planning to power wash my deck and stain it afterwards. But I am confused with most of you saying Bleach it, one says NO WAY! My deck was built in 1987 as pressure treated lumber 2" thick vs. the standard 1 3/4", and was let go for the last 5 or so years by previous owners who moved out of state. It has a Cabot red stain on it; most of it gone, and a lot of green mold. It is in full sun from 10 a.m. to 4:30 p.m and it is tiered, so it slowly goes down 4 tiers. No way staining can get on french doors.

I plan on using a 2 gallon sprayer for the stain when the time comes, but pressure wash it with a Subaru Costco pressure washer. Quite a bit of wood is in bad shape. We plan on replacing in the next year or so.

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  • What do the french doors have to do with your question? – Ecnerwal Jul 30 '17 at 12:53
  • The wood deck leads to the french door frame which also needs to be powered sprayed and finished to match the deck. Same kind of wood and age, – U-Stuff Feb 17 '19 at 19:26
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"Green mold" on a deck is almost certainly algae, not mold.

A bleach-water mixture (not straight bleach - perhaps 1 cup per gallon at the most, considerably less might be sufficient) will kill the algae and make it much easier to remove.

I happen to know someone who (evidently) is a big fan of pressure-washers and not much of a fan of bleach or scrub brushes. They'll go 3 days with the pressure washer to do what one day with bleach and a scrub-brush would do more effectively, and the traces of algae that are left behind recolonize in short order. You can be that guy, or not...

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  • not. I agree w/your take... – U-Stuff Feb 17 '19 at 19:31
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I had a similar problem years ago with cedar siding and a pressure treated deck that needed to be cleaned before applying a stain. I cleaned the mildew from the wood using sodium percarbonate. With a little scrubbing it worked very well. You mix the granular powder with hot water, and since you will be working on a deck, sweep it in with a broom, hose it off with water. The residual salts from the sodium are minimal and doesn't threaten the environment.

I bought my powder at the chemicalstore.com See the link:

https://shop.chemicalstore.com/navigation/detail.asp?MySessionID=211-708688697&CatID=&id=SPC2010

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