Approved cleaners for a wood dock on the Chesapeake bay

[The Roof Cleaners 14]

Long time no post.... I have a customer who we cleaned their roof and siding. Now they want us to clean & stain their dock. It has not been maintained in many years. I tried cleaning with only pressure, but the wood will not come clean without soaps. Does anyone know if there is anything that is safe/legal to use on the dock to help make this cleaning easier? Their house is on the Elk River and feeds into the Chesapeake bay. I have looked extensively online & can't find any definitive answers. I would love to do this work for the customers, but don't want to get jammed up by the EPA. Any info would be greatly appreciated! 

Thank you in advance for any help you can provide! 

Brian

The Roof Cleaners LLC 

[Beth n Rod 1,279]

Try searches similar to this.
approved cleaners for docks on chesapeake bay

 

I am sure there is something allowed besides water but finding it takes time.

Rod