I walked up the creek yesterday above my parents cabin out in the woods and dug some really nice looking pieces of driftwood out of the stream. I'm going to pressure wash them then soak them in a tub of bleach water for a while then rinse rinse and rinse again. I'm just not sure if there are any types wood I should avoid. I don't know exactly what kind of wood I've even got but one of the pieces kinda smells like Red Cedar. More than likely they are going to be Douglas Fir, Alder, Cedar or Myrtle because thats whats the most common around that area. I've also got access to tons of Manzanita which I'll also be using and I know it's safe. The pieces I found yesterday are very nice though and I'd really like to use them.