Right.. It's good to have something to fall back on in an emergency situation, at least.

[ No matter how unorthodox the method itself is. It's still better than Kyoko actually turning into a witch - that's just about the last thing they could use on a mission. ]

And if you ever need a way that's less drastic, you could ask some people here on the train for help! I know some of them can help cleanse Soul Gems pretty easily..