I swear by this stuff! I have sweaty feet and I'm always mortified when I'm at a "shoes-off" house because I don't know what my feet will smell like. To relieve that stress for guests at my place, I leave this in plain sight by our shoe rack so anyone can spritz it on their shoes or their feet. I use it whenever I've been walking a lot and it keeps the entryway from smelling like feet.
Promising review: "Even with the great reviews, I was convinced there was no way this would touch the stank in my son's shoes. While headed to town as a family we were struck with the stench of his shoes. It was so bad we turned the car around, drove 10 minutes back to the house, chucked them into the yard, and went to buy him new shoes (which also stunk after he wore them once). He lost the new shoes in three days, which was just enough time for this spray to arrive. I was forced to try this with the nasty yard shoes. OMG: After one soak in this stuff the smell was GONE! I sniffed hard to find that underlying stank that I was sure would be there. Gone. He's been wearing the newly revived demon shoes for a week at summer camp, spraying every day before he puts them on, and the smell is still GONE. Completely!" —Broncodriver
Get it from Amazon for $12.95.