Getting it squeaky-clean: Proofreading.

Every text, like every home, needs cleaning and housekeeping. So it’s comforting to know that a hard-working Jeannie is making sure even those hard-to-reach corners are spotless.

Cleaning a text means getting the spelling, grammar, punctuation, hyphenation and syntax right.
Beyond that, it involves assuring consistency and clarity, and taking a close look at the typography.