While you're at it, try apple cider vinegar. Not only is it harmless, it helps cholesterol levels
I am glad to hear that someone has found a harmless way to discipline a child. Too often, I hear of beatings or total lack of discipline. Another one that my mom found works is a soft-soled slipper to the ass. Stings like a bitch for just long enough to remind the kid that he's getting punished for acting up, yet leaves no mark, no bruise, and causes no damage.