Athlete's foot is a highly contagious fungal infection that can prove very difficult to remove. Like most fungi, athlete's foot thrives on moisture, and so it will often dwell in wet showers, where unsuspecting people step on the infected floor and subsequently acquire the fungus. If you acquire athlete's foot after using a shower or you know someone else who does, you should immediately take steps to disinfect the entire surface of the shower.
Remove all items from the shower. Throw away any used wash cloths or sponges and set your cleaning products aside for the time being. Try to do this at a time when the shower is completely dry, and wash each item before placing it back in the shower.
Pour undiluted white, distilled vinegar into a spray bottle and spray the entire inner-surface of your shower (not only the floors). Scrub vigorously with a clean sponge to remove the thick dirt and grime in which the athlete's foot fungus can dwell.
Spray a disinfectant bathroom cleaner on the floor of your shower, as well as on the walls and door. Scrub the entire surface vigorously with a clean sponge, and then use a second sponge or soft cloth to remove the disinfectant.
Dry your shower completely before using it again. You can use towels to remove the surface moisture, but you should still wait a few hours before showering again. Fungus thrives in moist environments, and a thorough drying can better ensure a complete removal. Open the window(s) in your bathroom to improve the air circulation in the room and accelerate the drying process.
If you have acquired athlete's foot from a shower, dry your feet and toes completely after each wash, and sprinkle baby powder or cornflour on your feet to absorb and eliminate any lingering moisture.