Dealing with smelly shoes is going to be much easier when you have a decent deodorizer around. The Panasonic Shoe Deodorizer [MS-DS100] can get the job done conveniently. Simply slip it into the MS-DS100 into your sneakers and let it deal with the odors. Nanoe X is diffused from the six outlets to all parts of your shoes.
The device has normal and long modes that can last up to 7 hours. Once you are done with the session, you can clean the deodorizer with water.