Best way to clean up lumber that's been stored for a while?

Esther Widgren
by Esther Widgren
Hubby bought all the materials to build a covered deck (mostly treated lumber) and it has been stored in piles for a couple of years. What is the best way to clean it up? We've got a power washer but don't know if diluted bleach is the best way to go. Any suggestions?
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