Apple cider and malt vinegar are two effective home remedies that can work as fly repellents for humans. While apple cider vinegar can trap and kill flies, you can use malt vinegar to repel them. On the burner, bring a tiny amount of malt vinegar to a boil. Remove the saucepan of hot vinegar from the fire and place it in the affected area. When the flies smell the vinegar, they'll flee in the opposite direction.