have you tried castor oil packs? If you want an alternative to some of the radical methods discussed in various forums, you may be interested in this and will find more information on the Edgar Caycehttp://www.edgarcayce.org/
(there also is a health database which I find very informative http://www.edgarcayce.org/are/holistic-health.aspx)
and various other web sites. Just google it.
I put the pack directly on the liver, and never have done the entire abdominal area as recommended. It is applied three days in a row and after the third application you take a teaspoon of olive oil.
I also sometimes start the day by eating a lemon on empty stomach. Half the lemon, short walk in the garden (or similar), second half with a little salt. The first couple of times I had mild abdominal cramps as reaction, but not any more. I only use organic lemons.
I haven't tried the 3 day apple cleanse yet, which is supposed to be a liver cleanse. It's basically eating apples for 3 days, nothing else ...
Carrots or carrot juice is good for the liver as well. I try to have a glass a day; doesn't always work out that way, but I feel the difference when I drink it almost immediately.
Hope that gives you some inspiration!