Significant blood stains were removed from carpet, which was a pleasant surprise. The company was quick to respond and came promptly when promised. My only criticism was that the serviceman who came to my home and worked on the blood stains was ready to call the job complete when he was nearly out of product rather than get more chemical and try to remove more of th stain. When I offered the hydrogen peroxide that I had just purchased for him to use with his equipment, he was able to get nearly all of the remainder of the blood stain out.