I forget but I do think that they said that hollows killed by non-Zanpakutous (or Shinigami in general?) simply cease to exist. I think that's the reason Shinigami disapprove of the Quincy's methods of hollow extermination. That being said, I suppose Aaraneiro and others killed by swords are definitely in Hell. Though Ulq got dusted from cero wounds so I'm presuming he's gone for good.
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