hmmm... i'm a bit wary of these sorts of things without being given medical advice/reccomendations to do it. in which case your doc could recommend a specific brand.

if you do want something to use to keep every going regularly, then fibre is the best "whole system" cleanser out there. something like metamucil would work a treat for this. a lot gentler than a one-off cleanser, and ultimately a lot more healthy too (imo).