I will not be beaten, so try again.
I tried Modelmates Moss weathering wash on the bare wood. This soaked straight in and looked too much. I only applied it to one'plank' so no loss there. Also tried this on the painted finish, where it offered a better effect. This stuff isn't waterproof. if you use it on a model don't forget to seal it in with a varnish coat.
Next I tried to simulate the silvering effect you see on old wood, with a 4H pencil, a silver pencil, and finally by buffing into the grain Humbrol 64 Matt Grey.
Fail, give up, go to bed.
PS; dont use Maskol on bare wood, it turns it pink