You are in general right about the different cleanses. Though the colonic does not do the small intestines. Oxypowder also does the rest of the intestines.
You are not late in noticing the Oxypowder . Orginally people used more colosan, but because of the ease of taking the Oxypowder , all the sudden more people are trying it because e.g. Raymond's experience. Of course it cost money, but you don't have to do it for months.
A new cleaner is the colonix, tested so far by -Bob and Southern belle. I started it to-day.