For a greater nutritional punch, soak them in warm salt water overnight, rinse thoroughly, then dry in the oven at no more than 120 degrees. (health.com)
Some people also add additional sodium into their detox water or use warm salt water as a detox drink. (detoxdiy.com)
You can also try soaking the foot in a mixture of warm salt water and olive or mineral oil. (animals.howstuffworks.com)