Louvered fence made of wood

Please advise on how to clean a wooden slat fence before painting it with wood stain. The fence has never been painted before, it is 7 years old and the top layer is already damaged by the sun, besides there are algae in the form of a green layer in some places. Should I use a pressure washer, sandpaper, a brush, etc.?

Please advise on how to clean a wooden slat fence before painting it with wood stain. The fence has never been painted before, it is 7 years old and the top layer is already damaged by the sun, besides there are algae in the form of a green layer in some places. Should I use a pressure washer, sandpaper, a brush, etc.?

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