I have read claims suggesting that the following remedies, among others, are effective against stinky shoes:
Sprinkle bicarbonate soda, baby powder or deodorant on your shoes
Put tea bags in your shoes (some also suggest adding a few drops of essential oil to them).
References for these claims: (1), (2), (3)
What is the action principle behind them?
reallyas in 'really work'. It sounds so much like yellow press and 'Do your really, really love me?'. Either it is a solution, which means it works. Or it doesn't work. Not only it doesn't really work - no, it isn't really a really working real solution. Urgl. 'Are these solutions?', 'Does it work?'. – user unknown Aug 04 '11 at 04:31