Easy Off Oven cleaner in spray can. Only original not low fume type. Better yet General Dollar brand,stronger yet. Hang stock with twine or lean against tree. Saftey glasses,cloth gloves and soak good.hose off let dry a few days. If you missed an area hit again. Pores are wige open,go over with 00 steel wool,blast with hose again. Let dry,let dry and stain
then your choice of finish. Did close to a hundred stocks this way as a hobby.