tnhillhugger1,
As long as you are not breaking the root skin or root hairs off, you are doing OK.
You may be over cleaning them or cleaning them more than necessary (or in other words putting time and effort into cleaning them that is not going to pay off anymore than if you had stopped earlier).
I have never seen a buyer complain about roots being too clean, but now I have seen them complain if you leave too much dirt on them (to where they actually look dirty) or they can actually scrape dirt off the root with a fingernail.
It is actually a rare occasion when I get my lil ES tooth brush out and usually only a few roots that just have some dirt on them that the normal washing process does not remove.
If I come home with a pound of green seng, I usually spend 5-10 minutes (max) cleaning it (not counting soaking time).
This year I did hunt in a hollow I never hunted before and found some good ones and man the dirt there was very stubborn and sticky. I spent 5-10 minutes on that batch as usual, but then spent another 10 or so going over a few nice roots that had some very dark sticky dirt on them that just would not wash off otherwise.
If you are spending more than 10-15 minutes cleaning a pound of green seng, I would say there is a very good chance you are over doing it.
Again as long as you are not damaging the root, root hairs, etc - then over cleaning is not that big of a deal, but when I get home from a seng hunting trip I'd rather spend that extra time letting my old sore feet rest and sipping a glass of my wife's sweet tea
TNhunter