We recently adopted a rescue female puppy so out came the My Pet Peed product. We used a black light flash light to find the stains. Low and Behold we discovered our 3 year old male had christened many areas in our home. We went room by room and sprayed every stain and it removed every stain. (Highly recommend investing in a black light flash light). It is amazing what you can spot.. A product every pet family needs.