No, definitely do not add bleach to the bath water. I'm glad you asked. It can burn the skin and the fumes can scar the lungs. In fact, before filling a tub with water you should have a filter that takes the chlorine out of your tap water. You can get a shower filter and fill the tub from the showerhead or you can get one of those chlorine removing balls that you put in the water as it is filling up.
Epsom salts is the main one that people talk about for detoxing in the tub. This article might be of interest to you - http://www.proliberty.com/observer/20080201.htm
I have also heard of adding sea salt, baking soda, or high grade hydrogen peroxide to the bath to detox.
Green or red clay is another one I have heard of for adding to the bath water. Some argue though that you absorb aluminum from some of the clays, which would not be good. So maybe it depends on the quality of the clay. Here is a webpage that may help - http://www.shirleys-wellness-cafe.com/clay2.htm
I know some like to add 3x, a neutralizer from www.Globallight.net, to the bath tub water.
I have also heard of aromatherapy baths with essential oils to help detox.
I would recommend searching for an ADHD yahoo group to join also, they could probably offer lots of advice.