Hi
There are quite a few posts about this so I've just cut & pasted my response to those (sorry, being lazy !!)
I've not really had too many problems with CM/EWCM whilst on clomid but after trying all these at same time I definitely seem to have more

& I've even bought some Pre-seed this month just to add to the list !!
I've been taking the cough medicine quite a few cycles now...I only take a couple of teaspoons each evening & also drink lots of water with it too but I think you can take more if you still have a problem with CM. The cough medicine doesn't actually increase your EWCM but it thins CM so helps the swimmers on their journey. You only need to take it until ovulation....
It's not any cough medicine though...it needs to be Expectorant & have Guaifenesin as the active ingredient. It shouldn't contain alcohol, anti-histamines or Dextromethorphan. It is important that you don't take decongestant as this dries up CM.
Regards the cough medicine mentioned...check out these links...
http://www.babycentre.co.uk/expert/561004.html
http://www.fertilityplus.org/faq/cm.html
I also drink grapefruit juice which is supposed to improve CM. I've been taking evening primrose oil (EPO) for years now for my PMT but this is yet another thing that can help with CM - however, it should not be takind after ovulation as it can cause uterine contractions (not UTI's). I swap the EPO for flaxseed oil (EPO ) after ovulation as this is safe to take whilst in 2ww & during pregnancy.
After ovulation pineapple juice is supposed to help with implantation.
Good luck & take care
Natasha