Hydrogen peroxide! I have three pairs of Vibrams and this is the only thing I've tried that kills the smell. Soak for 5-10 minutes. The insane bubbling is the death of microorganisms of stink.

I am really worried about the sugar content in these things because of the delicate ecosystem in the vagina. You don't want to be putting in anything that bacteria or other uglies will find hospitable. It just sounds like a world of no.