We "inherited" white carpet in the home we bought six years ago, while we never would install white carpeting in a home, we've dealt with it, because the carpet was new when we purchased the home, and it's a good grade. However it comes with the utmost in responsibility regarding up keep. Elite Floor & Furniture Cleaning did a remarkable job with it. Perfect visit, from being on time, to cleaning the carpets, to the DRYING time (they started around 10-11 and it was dry when we got home from work), to leaving us with booties, additional spot cleaner and a brush. I would strongly recommend them, and their number is on my speed dial.
UPDATE 2/5/2014
My husband and I also own a store at 16th Street and Camelback where we have commercial grade vinyl "hardwood" flooring installed. Justin came in and not only cleaned it to where it looked new again, but was knowledgeable on the material used, and gave us pointers on how to easily keep it clean. I still use him for our home carpeting, and now the business flooring as well. He also does a wonderful job on throw rugs!