I know I'm resurrecting a bit, but I just happened upon this thread.

I'm not crazy, but milk of magnesia is the greatest deodorant ever. I don't remember how I found out you could use it for that, but you can, I believe because it changes the skin's pH. I can go 48 hours without showering and no stink; 24 hours with exercise is no problem. I had already started using Crystal deodorant, which takes about a week for your body to adjust to, so I didn't have to get used to it. Not sure how it works cold turkey, and it didn't work for my wife as well. It must depend on your body's pH. Just put it on right after a shower or you clean your pits.