This is what I do as my first attempt - exhale through the pipe. Not as good as a pipe cleaner, but for a tiny gurgle, it can do the job.I think that's actually from steam. If I'm mindlessly puffing away, I might get that gurgle. When that happens I just ram a cleaner through without removing the stem. I've heard somewhere that occasionally exhaling through your pipe (blowing a bit of smoke up and through the bowl) can help prevent that, but I've no idea if that's true. I do it myself out of habit after learning that, and rarely get the moisture in the stem issue.