User blog comment:Hunterinpurgatory/How will Dean get out of Purgatory?/@comment-3481504-20120616162958

God, obviously. H's certainly got the mojo, or "muscle" as they refer to it as in the show. Although that's not how it's going to happen. Same goes for Death.

2 most plausible possibilities:

1) And even if Sam finds finds skin-embedded paper used in "Like A Virgin", he'd still have to sacrifice a virgin, which would require taking a human's life.

2) Or he could gather all the ingredients to open a door to it like Cas did in "The Man Who Knew Too Much" and again in "Meet The New Boss", however he'd need an eclipse.