Herbs that Drain Dampness

Which herb separates the clear from the turbid to treat conditions such as cloudy urine or vaginal discharge?

This shows up in the formula Bi Xie Fen Qing Yin (Bi Xie Separate the Clear Drink)

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 301 [Q827]