How to delete Backups.backupdb from trash

Good couple of points. I have reconnected the drive to see if I can empty the trash but no different. Because the TC is also my router I have just tried turning off wifi to try and then delete trash but no different.

I get 'The operation can’t be completed because the item “folders” is in use.' and then 'folders' changes to several other things before I get fed up and tell it to stop.

Just tried it - no problems found on the TC.

I've tried shutdown and restart too but no change.

If I erase the TM might that make no difference? In theory this is a backup from a completely different TC that it won't delete. The current TC shouldn't really even know it exists as it's never come from the current TC. It could fix it but I'm also wondering whether all I will achieve is to lose my entire backup and still have this problem.

I might have to do this, or just live with a trash I can't empty. I think I have historic things in my TM which I no longer have elsewhere. One of those things where I hope not to need to restore, but it's a good place to keep files I have since deleted off my Macbook to save space.

Though verify TM drive has found nothing of concern, so it appears to be functioning ok.

I can't see how I can find a way to erase the contents of my trash without having to essentially reformat a TC drive and lose all that data, which has nothing to do with the contents in the trash.

Yes it was a time machine backup, just not this time machine backup. Frustrating that I'm having to erase a perfectly good TM to fix this when the stuff in the trash is from a different TM machine. I can't see any other option.

Found an issue suggesting I might want to wipe the drive anyway : "First Aid could not unmount the volume for repair. Click Done to continue."