Bentonite cleanses the intestine. It depends on where you want to aim at.
I have passed the very same greenish stuff as you describe and I was wondering too, but did not get much of an answer. At some point I thought it might have been due to bile - cause bile is green - or else due to bile passage during the liver flushes. Now I think that this is mucoid plaque and I will carry on with the P & B shakes.