I haven't heard of the green tea but, I have heard of the Robitussin though. I also checked in TCOYF and here is what it said about the Robitussin (p. 173)
For "Limited Fertile-Quality Cervical Fluid"
Try taking an expectorant found in cough syrups such as Robitussin, or long-acting tablets of Humabid LA, both of which have the active ingredient guaifenesin. Along with helping to liquefy mucus in the lungs, it also has the added benefit of making your cervical fluid wetter. So if you only produce sticky or creamy cervical fluid, you could try this dosage: 2 teaspoons, 3 times a day, starting several days before your anticipated ovulation through to the 1st day of your temperature shift. (Caution! Be sure use plain Robitussin, since other types can actually dry up your cervical fluid.)
I hope it works for you!
Zachary James, 7/22/03-7/27/03, born at 26wks - severe pe
Miracle in progress... #2 is due February 2005!!!
Southern California Coordinator