Okay so I've searched and checked the FAQ available and still could not find an answer to this question.
I know all about the available offline option etc. and how it takes space and how to clear it, however, it seems when you stream a track and you don't make it available offline it does get saved for a little while, I suppose it stays in some kind of cache. Is there a way to free that up on demand without touching the "available offline" content? Also, how long does it stay cached before it gets automatically purged?