Take it from a medic-
Even though you are finding a great many 'home remedies' on this site, you should proceed carefully when choosing a method!
True Boric Acid IS NOT meant to be used ON A RASH or on your skin! It can be toxic to adults, children, and pets alike! It is meant for socks and shoes as a cleaning or drying agent and is NOT meant to TREAT the fungus!
Onion & garlic extracts have been used as homeopathic remedies with some success (though not proven to be full proof-it may work in less than 15% of the people who try it).
Baking Soda helps with drying and balancing PH
The use of household bleach as a direct topical application or soak for tinea pedis is not recommended, as it is a well documented irritant and diluted as an environmental decontaminant to prevent the spread of dermatophytes between animals, and from animals to humans.
Some podiatrists recommend soaking the feet in a solution of Epsom salts in warm water.
If you want true help in getting rid of the Athletes Foot, the key is not only keeping your feet dry but drying out the often raised rash which is sometimes accompanied by blisters or sores. Change your white cotton socks at least 2 times daily. As athletes foot can lead to jock itch and a variety of other problems, do NOT take a BATH-try a shower (wash the area gently with a mild facial cleanser or anit-bacterial soap). Then get a basin (clear plastic storage bins work great) & Soak your feet in warm water (NOT HOT-hot water irritates the areas and makes the rash worse). You can either add regular table salt to the water, vinegar, or plain tea bags (all three of these options will help dry out the rash and give an anti fungal cream or spray a better chance of being fast acting). Beware of corn starch as it often 'feeds' this sort of rash and makes it worse. Remember that chemicals like bleach, nail polish remover, tilex, etc & household liquids like Listerine may kill the fungus and germs but they can also have adverse affects including chemical burns and blood infections. It's always best to consult a doctor before trying home remedies as you may be allergic to many of the ones suggested online.
I've seen a case where a man used Listerine on his foot and ended up with 'jungle rot'-NOT a pretty picture. While it's GREAT for toe nail fungus, it's not so great for your whole foot!
Something else to consider is your stress level and body PH. High acid foods like sodas & tomatoes can contribute to skin rashes. Try adding more water, fish oil, nuts, & PH balancing foods to your diet! Also, de-stress...after all, everyone needs an ooosaaah moment! Hope this helps!!
Take it from a medic-