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Sometime in the distant past there existed a blog.domain.com for domain.com.  This was before we started work for domain.com.  During the process of optimizing domain.com we decided to 301 blog.domain.com to www.domain.com. Recently, we discovered that blog.domain.com actually has a lot of bad links pointing towards it.  By a lot I mean, 5000+. I am curious to hear people's opinions on the following: 1. Are they passing bad link juice? 2. does Google consider links to a sub-domain being passed through a 301 to be bad links to our primary domain? 3. The best approach to having these links removed?