Red mud on wood

Couldn’t find much about this. Got a 305x8 foot fence and 15x18 foot deck with hand rails to do in a week. He wants me to clean it so he can put stain on it(2 months after i clean it) i told him he should just wait till hes ready to stain it before i wash it but he wants it cleaned now. Most of the fence has red mud stains around the bottom.

Downstream potash, rinse.

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Thanks IBS.

Also it made me think of these. So i had to go buy some.