The uterus is cleansed over time by cleansing the colon and liver. It's when the liver is overloaded that toxins end up in the uterus.
Chinese bitters comes in a pretty large bottle. You can take it for three months no problem, or until the bottle is finished, and that should be enough for this go-around. Also be sure to write to Julia - the Chinese Bitters lady - and see if her Fem-Mate is something that would help you. She's the expert on estrogen issues. :)
Dredging kidneys etc., is a way of saying cleansing/detoxing, which involves flushes and herbs, diet, etc. The whole shebang! :)