I'm experimenting with putting a bar of deodorant soap in a "soap sock", or whatever those plastic mesh bags are called, in each shoe. Seems to help and I'm reluctant to put my dance shoes in the oven at 120 F for 30 minutes like some people have suggested.

Fresh Wave did nothing at all; there's a deodorant aerosol that DSW sells that does some good.

I also have a bar of rock salt which is supposed to inhibit bacterial growth when rubbed on damp feet - haven't tried that yet.

I also might try a car deodorizer hangy thing in each shoe - those are usually powerful enough to give me a whopper of a headache so they might do the trick.

Lysol spray?