MorphManager will remove them. As will PoserFileEditor. The first is free, the other is not.

Are you using MorCloth? I haven't run into any duplicate morphs there (yet)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.