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After all the raves about this product, I was a bit disappointed with it. My carpets are only three years old but I clean them each year to keep them fresh. This product was okay, made the carpets smell nice and I will try it again sometime but I can't say it made that much of a difference. I know it won't make them look like new but I did think the results would be better than they were. Still cant have everything and it didnt do the carpets any harm. If I hadn't tried I wouldn't have known!!