I am pretty sure that sterile gauze pads, the kind that is designed to soak up blood from a wound as is used by every Remicade nurse, if folded properly to fit the contours of your rectum, will be a better absorbent than cotton balls. Something like these:
i use those gauze pads daily with Ilex and i shove it right up against my hole, just in case i get a little leak. Some days none, some days a little. Never to where i full on crapped my shorts thank god, but sleeping at night is basically a "crap shoot", lol. But are you saying to actually shove the gauze pad up inside there?