Ding

I don't know of any certain products...I but I would suggest upping the intake of different kinds of fibre in your diet. i.e. making sure that you have a good amount of soluble and insoluble fibre from different sources like oatmeal, beans, vegetables, whole grain cereal and breads, nuts and seeds (flax seeds especially are beneficial for the colon), blending lots of fruit to make smoothies, and of course drinking more water.
Eating live natural yoghurt is also very good for the colon, in terms of ensuring a balance of good bacteria.

I honestly think that eating a fibre rich diet is much more beneficial in the long term for your digestive system than any short term colon 'cleanse' product. By eating and drinking the right types of food your colon will becoime 'trained' almost to cleanse itself and shouldn't need any extra help.