I noticed something odd and wondered if what I think is happening, is happening. We bought a device that seems to stop cats from spraying, by releasing a pheromone that makes cats happy. https://www.physicsforums.com/showthread.php?t=389106 I thought it was odorless, but, oddly, whenever I gargle with Listerine and then immediately walk into the bedroom, I can smell a weak, unusual, but distinctly detectable odor that I logically attribute to Feliway unit. We have been here twenty years and I have never smelled that smell. Does this make any sense? Can one odor or flavor make one more sensitive to others? I don't want to remove the unit long enough to test this as the cat would likely spray in the bedroom again.