Try power washing alone. If the green doesn't come completely off, you may have to spray on some chlorine bleach, let it sit awhile, and then power wash it again.
Here is a step-by-step instructions from Wiki How, which includes telling you how to keep the mold off your fence in the future:
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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We live in Florida and have a screened-in pool. In the spring, our screens get covered with pollen. You can't see it when you look at the screens straight on, but at ...
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I would use water and soap but I don´t know wheter sisal rugs shrink with water. Some stains are from spilling drinks, some others were produced by pets.
Power wash it or scrub with a stuff brush and hose it off.
Try power washing alone. If the green doesn't come completely off, you may have to spray on some chlorine bleach, let it sit awhile, and then power wash it again.
Here is a step-by-step instructions from Wiki How, which includes telling you how to keep the mold off your fence in the future:
https://www.wikihow.com/Remove-Mildew-and-Algae-from-a-Wooden-Fence
I read where pool shock mixes with water and a scrub brush work perfectly.