Keto Ultra Some things to watch out for when doing a colon cleanse include the necessity to safely and comfortable eliminate the putrefied bacteria, parasites and mucosal lining that has been inside, perhaps your entire life. That is a definite must if you never did the kind of cleanse that releases that mucosal lining - a rubbery mass that, having been in the colon for so many years, bears the shape of the colon walls against which it lodged.