My Boyfriend has smelly feet. What can I do because the warmer it is, the worse it is!?

He has tried talc powder, sprays, everything! Is there something natural he can use? Or anything?My Boyfriend has smelly feet. What can I do because the warmer it is, the worse it is!?
Has he tried bathing them in water which has potassium permanganate dissolved in it? It is a dark purple soluble crystalline solid, so don't bathe too long or the feet will turn purple for a while! It can be bought at a chemist or pharmacy. Do it about 10 minutes a day a day for 4 or 5 days (or more if it is really bad!)
He might want to see a foot doctor - He might have something fungal going on down there. It sounds like it's out of control.
If he doesn't change his socks all the the time, have him change them every day into clean socks. And when its hot out side or nice have him wear sandels/flip flops to air his feet. This should be better.
baking soda & vinegar it gets rid of animal pee smells,i would mix it together and put it on for 5min then wash it off,,,maybe his docter could help with some meds also,,,,,,,lol
If all else fails turn it into something fun, turn his feet washing into foreplay. Make it a game where the two of you take turns washing each others feet. This may not be a long tern solution but for the time being your room wont smell like feet.
make him always keep his shoes on