I don't know how it happened to me, but my feet were just going crazy. I would buy a new pair of shoes or evan sandals, and a week later they would just smell like booty. I take 2 showers a day! I even tried powders. When I thought I was going to have to through away yet another pair of sandals that I had loved, and searched hard for I found the trick. First I scrubbed the inside of the sandal with dove antibacterial soap, they I made a paste out of white vinegar and baking soda, and let that set in over night. Then I rinsed it, and let them sit in the sun to further bleach it out. Ok I killed all the germs there... now the cause of this problem... my feet. After soaking them in hot soapy water for 20 minutes, I dried them, and rubbed coconut oil all over and between my toes. Then put on some socks before bed. ( I do it every night now for good measure) Ahh the smell is finally gone. Coconut oil, it does a stinky foot good.