I didn't give it one star because I don't even know anything about the effectiveness of this product. Because I would never put this on my upholstered furniture. Never. Considering it includes various oils as the active ingredient and castor oil as an inert ingredient. So...what exactly happens to the upholstery over time when you keep adding oil to it? I don't think you need to be a chemical engineer to know it's not going to be good.