I'll tell you this, if it's something to do with any residue that might happen to appear during the day from having a case of the soggy farts, or not being able to clean as well as you would like, due to not having home field advantage....,count on your handy removable shower message head. Turn it to high pressure, squat, and aim, wash with soap, rinse THOROUGHLY, in same squatting position.
Squeaky clean balloon knot, EVERY TIME.