and I don't know exactly where 
In mitigation he's v cross at the moment as he's still on house arrest post-surgery but still!! He's got three, yes THREE, cat trays which he can use so I know it's a protest wee
He must think I'm very stupid as I just don't understand he wants to go out 
Any tips for tracking down the source of the smell or is it just a case of clearing everything out of the way and sniffing ... Then thorough cleaning with simple solution?