Used in a very challenging situation, an elderly relative who was basically “overtaken” by her cats when she was struck with an illness. It was quite effective with cleaning the walls where they had sprayed, and when added to laundry for cleaning slip covers and such. Some items were simply non-recoverable, but after a full cleaning and a going over with this on the floors and wall the house was a different place to be, not perfect but very livable, fresh and clean. She was able to return home after a long convalescence without being overwhelmed by the task of trying to get her place back in order. Found it less effective on the concrete floors and wall in the basement due to their porosity, but it was still night and day from when I started to when I finished and in the spring I intend to go over it again now that the situation is under control.