I've done a bunch of GB or liver cleanses. It's a bit taxing on your system and time so you would want to be prepared in that sense.

Some people get great results from GB cleanses; I personally havnt but then again some people need to do a bunch before things start clearing up.

Not sure what a kidney cleanse is but like the above poster talked about with esparagus; its a great urinary tract/kidney cleanser. Juicing books recommend you eat or juice it raw; because that and spinache produce (ahh darn my memory cant remember the name of what it produces and its effects (olic acid and gout?) darn mercury and my memory <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />)

anyways ...