They were fine when we first moved into our house nearly 4 years ago. Over the past 18 months or so they have started pissing on spot at the bottom of the stairs on the carpet. And intermittently elsewhere but this is the worst as its on carpet so very difficult to clean and a horrible brown stain is developing despite cleaning it regularly with specialist cleaner containing enzymes to break the urine down.
Worser than this is the grim smell of cat piss that permeates throughout the downstairs.
It had got recently worse as there is a cat that has started coming through our cat flap so we've changed this to one that only let's ours in although it isn't registering their microchips at the moment so that is a work in progress. We've tried feliway with no real noticeable difference. We're really reluctant to get a litter tray as were not convinced they'd stop now plus we'd still have the smell and don't have a utility room to keep it out of the way.
So still and any tips appreciated! In particular of any cleaning tips to try and stop the angel /