No wetting of the wood is necessary. Just the wet, but not dripping, cloth(a face cloth works well) and a normal iron, set on cotton, will raise 'em as much as they will raise. Only does so much though. Won't do anything to cut fibres. The steam will also raise any cartouches, so watch where you put the cloth.
Won't remove a tung oil finish, but might pull out some BLO.