Are subtitles cached? How to clean them? They are removed from disk but still in the interface visible

I was cleaning my file system, I have a folder with episode files and subtitle files. I deleted the subtitle files, because 1. they were out of sync and 2. the episodes had built in ones.

But they subtitles still show up in the Plex interface/player. Are they somehow cached? How do I remove them for good? Or (better: and) how can I force built-in subtitles over external ones?

“Episodes” sometimes have 608 Closed Captions - buried in the video stream - and are ‘invisible’ to normal inspection. These are most likely, but not always, contained in MPEG-2 streams from TV.

Note:
It’s not very often a video track is tagged with a language - and 608 Closed Captions will very likely appear as ‘Unknown’ as such. The cure for ‘Unknown’ is to tag the video track with a language, but a full on re-code is the only thing that will “Remove” them from a video track.

Note 2: Plex doesn’t clean up after itself - at all. If you use the UI to delete an item, Plex will annoyingly leave everything that was not the actual video file in the folder, as well as the folder. IF there is a subtitle file in an otherwise empty folder that was associated with a video file and another ‘version’ is used, or still available - the subtitle file may still be available. Seek and Destroy manually is the most sound advice I can offer.

Note to Plex:
Delete Means Delete To A User.
That means Delete Everything.
Delete does NOT mean Partial Plex Customized Delete the user has to complete later at great inconvenience.

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