Try cleaning with a 1 part bleach to 10 parts water. You can use a spray bottle. As a RN, I LOVE BLEACH!!! It kills everything, including HIV( fragile virus when not in the body). I use it to clean our counters, litterboxes, and all surfaces that the cats go on! Steriods are just a temporary fix. It suppress the real problem that will resurface after the steriods are stopped. And it also masks infections, can produce depression, and increase appetite....Good luck with your cats, will light a candle for you all!!! Sandra