I used this product on a few old, reoccurring stops in my bedroon that traditional carpet shampooing hasn't removed. Following the instructions, I sprayed it down, waited for the solution to soak in and, then rubbed the whole area with a towel. Amazingly, it works well. I'm not sure if the area is perfect, but it is better that with other treatments. With other treatments spots come back because of the chemical residue in the carpet attracting dirt. With Dyzolv, not sure yet. Otherwise, I would have rated it five stars. But after a week of treatment, so far so good.
We tried this in the RV on carpet that has seen a season of wear and dirt. Used the Dyson Vacuum (also from Overstock) to really clean the whole RV well and then this product to spot clean the carpet. It was as stated, easy, worked well on old stains and a brand new chocolate milk stain, also. I was glad to have it on hand.