I'm going to make some picture frames out of driftwood to display some of my darkroom prints. The driftwood comes from the sea. The prints will be mounted on mount board and with overmat to make it quite archival safe.

So before I make the frames..
I wonder if there is anybody with advices regarding if the wood needs some kind of chemical treatment or if it's enough just to wash it with fresh water and maybe soap? I want to make the frame as "archival safe" as I can with that kind of wood. The print will not be in contact with the frame, but the mounting board will.