This product is wonderful! I had a horrible stain in front of our sectional couch from everyone's dirty shoes that I have tried and tried to get clean, but the stains never really came out and it was a big long, DIRTY, DARK stain on a light grey carpet. I never tried a pre-treat on it before, so I have nothing to compare this product to, but as soon as I got it, I sprayed the area real well and left it on there for 25min - I then pulled out my heavy duty Hoover carpet cleaner and went to work with the Bissell carpet cleaner solution and super hot tap water.  I had to go over the spots quite a few times to get them clean, but to my AMAZEMENT the whole stain came out!!! I have to warn when you first start cleaning anything this bad, the carpet looks really bad before it starts looking better. The stain was SO bad when I started cleaning it I think because it was wet, but then the more I went over it the cleaner it got and when it was dry, it looked awesome! There is a little residue, but it has never looked this good. It saved me from having to buy a area rug to cover it. Now I make everyone take off their shoes before they come in the livingroom. We'll see how long that lasts, but I'm happy for now. I also had a wine spot in the dinning area that i could never get out either and while I was working on the couch area, I let the pre-treat work on the wine stain and that came out too!!