>> after my first fast (seven days with only water) i reported in my blog that my first bowel movement after breaking my fast had this weird rope-like stuff in it!
That's exactly what I was trying to say earlier, the old/tough stuff is not created by colon cleanses. It comes out at many times, during colon cleanses, colonics, even at the end of fasts. Chances are you'll only see it once or twice (if at all), especially if you're slim, fasting and eating organic food.