I don't know what to tell you. I had this trouble too. Had to cover all the beds with plastic. The only thing that fixed it was when my old Himalayan crossed the rainbow bridge, and my sister moved to Central America with her barn cat. Now, my young Himalayan has a house to herself. She was spraying pretty bad. Now she isn't spraying at all. I guess the good thing is, once started, it will stop ... if you remove all but one cat from the house!