Two 2TB internal drives in tandem for Time Machine; only one backup deletes.

I'm using two 2TB internal drives in tandem for Time Machine and deleted some backups while in Time Machine. They deleted from drive A, but drive B still has the files. Is there a way to delete these? I tried unmounting drive A in Disk Utility but then I can't enter Time Machine.
I love the dual backups, but should I be able to do dual deletes of all backups? I don't see a way to accomplishg this except to force Time Machine to do a backup, then do that again so it switches drives, but that seems a bit convoluted.
If one of you guru types has an answer I'd be most interested.
Thanks.
Mike
Mac Pro 3.1 8 Core ML.3

You can manually deal with this by using the "Browse Other Backup Disks" function which is accessed via holding the opt/alt key and while selecting the TM icon in the menu bar.
You can then delete the instances of the desired files in each backup set.
Not elegant, but I wouldn't expect that this will be done automatically, as there are a lot of permutations of how you use multiple backup sets.

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