I was just doing a bit of reading on hostile mucus too, coz I'm on Clomid & just realised that this can be a side effect of this. Feel like I have a lot of watery CM at the moment, only noticed EWCM once on CD11 (due to ovul on CD16) so I don't know if I have it or not. Just started taking Blackmores Evening Primrose Oil yesterday (2 capsules daily) & last week started taking Blackmores Pregnancy & Breastfeeding Forumula (2 capsules daily). Haven't tried Robitussin (or similar) yet nor a sperm friendly lube.

Found this in my reading by doing a Google search on "hostile mucus" (use quotes), it shows 'Pre-Seed' lubricant is sperm friendly, and provides a link to studies done on major brands 'KY', 'Astroglide' & 'Replens' which they found are NOT sperm friendly, even though they apparently claim they are. Here's an extract...

"Pre-Seed is the only lubricant on the market that has proven to counteract the hostile mucus problem AND is not harmful to sperm. The vast majority of personal lubricants on the market today are not sperm friendly and actually reduce your chances of conceiving due to the fact that they harm the sperm."