(he said red faced) but here goes:
Lately, I have had an issue with moisture collecting in the 2nd valve. After I play a bit, I typically blow out the water keys on the main tuning slide and the 3rd valve slide. But no moisture comes out. I start in again, and get a gurgling. Blow out waterkeys again, to no avail. Then check second valve crook, and low and behold, its in the 2nd valve-great gobs of water. I thoroughly blow that out (which is embarrassing enough, seeing as how you can't just discreetly open a water key and blow). In a short while, it is back again. For practice, I can live with it. But when I get to doing gigs again, I don't want to be blowing out the 2nd valve in front of an audience.
I have left the horn on its stand, hoping to dry it out over night. I have put it away in the case so it's on it's side. Neither helps. Interestingly, this is a new problem I've never encountered before. It is almost like more water is accumulating in the horn than I put through it. Oil is Hetman's No. 2. That's the only change I have made. Switched from Al Cass.
Anyone have any ideas?