I get a big carton of Epsom Salts at the grocery store for about $2.50. A box of baking soda is another dollar or so. I use a cup of each in a tub of warm water.
The Epsom Salts help you detox through the skin and the baking soda keeps you from reabsorbing the toxins. Stay in the bath for at least 30 minutes, then rinse off under the shower to wash off the toxins.
I can't believe how much better I feel when I take one of these detox baths in the evening. I sleep wonderfully and wake feeling much more clear headed. My skin looks better as well. Make sure to dunk your head and immerse your face as much as you can -- no point in leaving toxins there!