Stinky feet indicates a bacterial infection and not a fungal (atheletes foot) infection. The quick cure is water-based hand sanitizer with benzalkonium chloride. Wipe it on your toes to kill germs and normal foot sweat will spread it into your shoes. In a week or two your shoes won’t stink either.
Fingernail fungus seems to be curable with shellac! I found this out by accident after accidentally dipping my thumb in a jar of it while finishing a cabinet. The shellac penetrates the soft fungus and suffocates it apparently.
Dandruff is often fungal rather than just dry skin, so an anti-fungal dandruff shampoo with selenium sulfide does the job. Dandruff shampoos without an anti-fungal can be worse than useless.
My dog had a small fungal infection at the root of her tale underneath. Tried everything the vet sold us and couldn’t get rid of it. After years was still there. I quit using the vet meds and started washing it daily with original Selsun Blue and followed up with Prid drawing salve for the itch. It’s finally gone.