Power Cleaning fills the maintenance box with the ink it uses for the Power Clean but doesn't print. It saturates the pads in the maintenance box (some boxes can't be swapped out, it seems). She says you don't even need to do Head Cleaning. Just use Purge Files.
Alternative cleaning method: just try to get the nozzles printing by doing pure colors. 'Purge File.' The Hex Codes for CMYK.
Purge file for Cyan