Next door's cat seems to use our front door step as a toilet, and an area to "mark its scent". The smell seeps through the bottom door frame and makes our hallway smell disgusting! Also, I am always rolling my pushchair in and out picking up various unpleasantaries on the wheels!!! How can I keep it off our door step? So far we have tried: Catapult, pepper, Dettol, orange peel... Help!!