How do I remove playlists and other sources from old accounts or services that are no longer active?

For reasons not relevant here I had to resubscribe to Qobuz with new account credentials.  Sonos is still showing playlists, albums, etc from the old account and the new account at the same time. Since I don’t remember which was on which account, I frequently start to play something from the old account and Sonos goes all algo agro on me.  “No can do” it seems to say.  Except it says it in far less poetic ways.  

How do I get rid of all of those defunct sources from the old account? I would think that Sonos would just sync with the credentials it has NOW, and not show stuff from an account that is no longer active, but sadly it ain’t doing that. 

And, of course, I can’t go onto the Qobuz website and manually remove that stuff because, well, the account doesn’t exist any more.