Years ago I had bad foot fungus. My feet smelled so bad that my wife wouldn't let me take my shoes off until after we ate. Her elderly uncle said that I should soak my feet in bleach and water every night for a week. I have not had smelly feet since and if I do start getting something on my feet it's back to the bleach and water.
You want enough bleach in the water so that the water feels slippery. Maybe 2 table spoons in a gallon of warm water.
Cheap and it works great.