Wipe the drum out with Surgical Spirit. Whisky, gin brandy or rum would do the same job but then perhaps people would think you an alcoholic.
I dont drink anymore and sister didnt think much to giving up her rum for solving cats pee!
I found a 'service it' cleaning solution, bopped the whole bottle in and its done the trick
Poor lad has gone round respraying his fav spots but its not having the desired effect
look on his face is classic