Thank you for the advice so far. I'm not too concerned about leaving some cambium on - if it doesn't hurt anything. Attempt #1 was a Shag Bark Hickory, and I kind of liked the look. I don't have a power washer, but I've heard about the spoon technique a few times. I don't understand how that works. I may start gently w/ my dull draw knife and see how it goes.