As both an antiseptic and fungicidal remedy, tea tree oil is a great remedy for onychomycosis. First clean areas on and around the infection with rubbing alcohol then apply undiluted 100% pure tea tree oil (such as this Plant Therapy Tea Tree Oil) directly to the affected nails and let it soak in. After about ten minutes, gently scrub the nail with a soft bristle toothbrush. When applying tea tree oil directly to skin, consider mixing the oil one-to-one with an all-natural carrier, like olive or almond oil. Repeat daily until the new healthy nail grows out completely, then continue treatment for two to three more weeks to prevent regrowth.
When athlete's foot fungus or infested skin particles spread to one's environment (such as to clothes, shoes, bathroom, etc.) whether through scratching, falling, or rubbing off, not only can they infect other people, they can also reinfect (or further infect) the host they came from. For example, infected feet infest one's socks and shoes which further expose the feet to the fungus and its spores when worn again.
Use soap and water to wash your feet, and dry well, including between toes. Trim your toenails -- straight across -- to keep them shorter than the end of your toe. Make sure the tools you use are clean, too. Wash clippers and files with soap and water, then wipe with rubbing alcohol. You might be tempted to cover up discolored nails with polish, but don't. Your nail bed can't "breathe," which keeps fungus from going away.