I have an ileostomy, and poop in the sink sounds disgusting. There is no need to rinse the bags out. It is more of a psychological thing. The bags are odor free when closed, and with an ileostomy to rinse it out would be an exercie in futility because there is a slow and steady output all the time anyway. While I'm on the toilet, though, I tear off a piece of a flushable baby wipe and clean the bottom (tail) of the bag before re-closing it. I do that to keep the clip clean and the outside of the bag clean, not to keep the inside clean. I also know some people with an ostomy who use a squirt bottle of water to rinse out the bag while on the toilet. So I would suggest flushable baby wipes and/or a squirt bottle of water for use while on the toilet.