Nope, no discolored goop or discharge.
Milo has actually sneezed on me once, there was nothing that I could see, it was a very light mist of ... nothing, lol.
They do have a discolored stripe running down their noses, but I think that may be where hay dust collects? Since the ridge is kind of like a canal. It's not crusty, and I usually just gently rub it off on cleaning day.
If you see what I mean?