Hi all .
Dont know if this is an old wifes tale ?
But my elder sister swore by it , she always was the butt of jokes because her feet kicked up so much, they were evil.
Someone told her to clean her feet soak them in egg cup full of vinigar in a bowl of water with half lemon juice for 0.5 hour 2/3 times a week , she did it worked for her ,
must rince feet after put no creams ect on, clean cotton socks so you dont pick up any dirt on your feet.try also to have alternative shoes to wear so you can clean the others and allow them to dry , clean the shoes with the remaining lemon juice.
its worth a try it worked for her .
good luck , let me know how you get on