Junior lien not removed from title after foreclosure

In California, “At foreclosure auction junior liens are typically wiped out”. In this case the junior lien remains on title more than 6 months after the foreclosure sale (foreclosed by senior lien, repossessed by senior lender). What is needed to remove that junior lien from title?

Hmmm… this may be a wording issue. Junior liens will stay on the title history forever. Nothing that I know removes documents from the county recorders index.
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The key is that it no longer has a claim on the property, and as such you can buy/sell the property without having to pay it.
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If it was truly a junior lien you should have no problem getting title insurance that protects you from any claims that lender makes.
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In any case you should be able to clear it up very quickly with your title company.