I searched the discussions, seeing nothing on this. So here's my experience with it. Mind you it's only one use. I shall keep using it and alter this as/if necessary.I usually take a 1.5 - 2qt preliminary lower soapy cleanse prior to using a colon tube for the 4 qt main event. Today I tried a bar soap by Dial with Marula oil. It is a glycerine soap, so it produces the desired effects quickly and thoroughly. Not so much cramping and a quick evacuation. Very pleasant scent. The colon tube went up readily with no fuss. That's always a pleasure.