For this one off problem, I would consider renting one if you are set on a big unit. I have a Hoover that is at least 10 years old. It's good, but my daughter used it and said that she could get her carpet clean in half the time with one of the rental units. I like having my own because when I get in the mood to clean the carpets, I want to do it NOW. It works for me. It is astonishing how much dirt it gets out of my carpets. I would pre-treat before you start, because none of them will get it all out without some work up front. I have used one of the car carpet cleaner products with the brush built into the top of the can. It worked really good, but then the rest of the carpet needed cleaning after I finished. Darn! Still had to clean the whole room.