Soaking feet in vinegar is a popular remedy for toenail fungus, using its antifungal properties to kill fungal cells. The acidity in vinegar creates an environment that's inhospitable to fungi, disrupting their cell membrane and ultimately leading to death. White vinegar or apple cider vinegar can be used for this treatment, soaking feet for 30 minutes to an hour twice a week is recommended. Maintaining good foot hygiene and wearing clean socks are also important preventative measures. Results may vary from person to person, but many have reported success with this natural remedy.