Based on the photos from my colonoscopy it appears the colon is completely clean from a simple fast and laxative, in my case I believe it as Go Lightly. Colon walls were pink and nothing else there.
You know what's funny is that all these 'cleanse' things inevitably mention how John Wayne was autopsied and had a lot of undigested meat (pounds of it) in his large intestine. Sounded nasty and I knew someone who was parroting the same thing so I looked into it and it's an urban legend. I don't recommend doing the same thing as I ended up reading things you will want to scrub your eyes out with Clorox to forget.
It sucks to have such a thing associated with a man's man like John Wayne.
Same here. Two servings of the pre-colonoscopy elixir
and the plumbing was clean as a whistle.