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If there aren't too many of these links then you might not need to bother. Whilst low quality IBLs can hurt your site I believe that a lot are needed. I think we're talking hundreds here.
your efforts will be better concentrated counter acting these links with high trust links instead of trying to get rid of them.
joined:Dec 29, 2003
But if there are only a few crappy links then I would agree that it's not worth the time trying to remove them. Google might not even be counting them.