What does 2 Chronicles 29:16 mean?

The priests went into the Lord’s temple to clean it out. They brought everything unclean they found in the temple out to the courtyard, and the Levites carried it all away to the Kidron Valley. 2 Chronicles 29:16 - Modern Text Bible

(The priests did the actual cleaning inside, while the Levites helped by hauling out anything that didn’t belong, making sure the temple was pure again.)