Hi Fish&chips. I copied some of the info, here you go:
Improving Cervical Secretions
Cervical secretions are vital to fertility. They indicate fertility, and aid the sperm in their journey. The cervix is filled with a mucus secreting membrane. Estrogen changes the cervical fluid. the vagina gets moist wet and slippery, secretions may show on your underwear and toilet paper, and this fluid becomes stretchy like egg white if stretched between finger and thumb. The mucus will stretch 2-4 cm when you are most fertile. The fertile mucus creates ease of passage for the swimming sperm through the cervix. Progesterone kicks in immediately after ovulation which dries up this cervical mucus and gives it a lotion like character.
When you are not detecting fertile cervical mucus, it is possible that you are ovulating right after you are bleeding so that the fertile mucus is blended with the blood.
Other causes for inadequate cervical mucus; low estrogen levels (low body weight), rapid weight changes, too much wheat bran in diet, vitamin A deficiency, antihistamines, ulcer medication, clomid, some antidepressants, too much exercise reduces circulating estrogens, smoking, high doses of vitamin C dry up mucus, synthetic underwear, fabric softeners, scented toilet paper, tampons, vaginal lubricants, pH out of balance, and poor sexual techniques where the woman is not excited enough to produce sufficient secretions.
Cervical secretions can be improved by; eating foods rich in B vitamins, drinking plenty of water, and including wheat germ in the diet all can help.
If you have determined that your pH balance is off the following is a quick dietary reference to help.
Alkaline foods (to correct acidity): [/B]millet, almonds, seaweed, beets, artichokes, asparagus, green, broccoli, brussels sprouts, celery, cabbage, carrots, cauliflower, kale, cucumber, endive, escarole, leeks, kohlrabi, lettuce, onions, garlic, ginger, parsley, potatoes, sweet potatoes, pumpkins, turnips, watercress, brown rice, apples, apricots, fresh figs, bananas, berries, melons, kiwi, grapes, lemons, limes, pears, plums, peaches, mangos, papayas, bamboo shoots, bok choy, parsnips, eggplant, okra, peppers, radishes, swiss chard, rhubarb, spinach.
Neutral foods: yogurt, butter.
Acid foods: lamb, chicken, turkey, goose, duck, salmon, white fish, eggs, beans, barley, buckwheat, oats, rye, white rice, mushrooms, raisins, beef, veal, pork, ham, bacon, cheese, goat and cow milk, wheat, corn, tomatoes, oranges, grapefruit.
grapefruit juice!!! 
