Dr Christopher refers to using prune juice in his 3day cleanse book. Excellent read for a mere two bucks.
I can only find dehydrated prunes which I then soak in water over night, follwoing morning, remove the pips, blend with a cup of water, and then drink by diluting 50/50 with water at 6 am. Would be interested to hear other methods of making prune juice, and what elese is out there.