[Considering what Soma keeps in his pockets, he can't even say anything about that being weird.] It would depend on the kami and their domains. They'd have to be pretty powerful for what I have in mind - powerful enough to completely cleanse the spirit in one go.

[Fortunately Madoka already has that going, but that's another thread so...]

Still, it can't hurt to try. If nothing else, it should help with damage control.