I use this to hide smells of other cats (which seem to spray the outside of our cat flap during the night – yuk) from my own cat (who is locked in but gets upset by the smell of the other cats, so used to often spray his side of the cat flap – also yuk). A couple of squirts of this on the inside of the cat flap at night mean he can’t smell any of the other cats’ spray on the outside, so he doesn’t spray on the inside. Simple solution. A bottle lasts me ages, maybe a year. It smells nice to me too