Meeshe (orange) although visibly clean has the stinky butt syndrome, and the vet has to empty his anal glands periodically. Schuyler (white) exudes no offensive odor yet collects fecal matter outside that area and simply refuses to cleanse his anus, so his meowmmy (that's me) must take baby wipes in hand and tidy him up now and then. They are both neutered males and at the risk of sounding sexist I will do it anyway by offering an overused cliche . . . maybe it is a guy thing??!