I can't post a video for you, but have been doing this for some time now with just my Legend XL running a slightly higher flow of 7.5.
It won't get all, age, thickness or gum, type of carpet all come into play.
I do find that a quick going over with the wand if niot successful, will usually warm and soften the gum to increase the efficency of the citrus gel and then it comes away easier.
I feel it works slightly better running an in tank extraction detergent compared with an acid rinse.
John


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