Hi, there are many over the counter remedies for athlete's foot available. I heard for that rubbing tea tree oil is good for reducing athlete foot's symptomps because of its antifungal and antibacterial properties (should be mixed with a carrier oil, like coconut oil, otherwise it will sting). For crusty foot I found generally sea salt bath good as remedies. But I would maybe inform myself more about this or consult a doctor before trying any of this.