What kind of cleaning products kill athlete's foot fungus in the gym?

Standard likely. Anything with bleach in it should kill athlete's foot fungus. The problem is that people who have it do not always treat it, and they can pass it on to others. People should wash and dry thoroughly, and change socks/clothes dailty.
Any good cleanser... ...Particularly one containing bleach, will kill just about any infectious organism, including the athlete's foot fungus. But it has to be done diligently, and regularly.