Homemade Foot Detox Recipe Take 1 cup of Epsom salt, 1 cup of sea salt, 2 cups of baking soda, and several drops of lavender essential oil. Mix it well. Take ¼ cup of this mixture, and fill it with hot water (the temperature you think can withstand) in a foot tub. Soak your feet for 20 minutes. Relax and enjoy.