Humans are carbon-based cellular lifeforms, and as such we tend to leave disgusting residue on all surfaces after a while. And I'm sure someone's spilled a few bottles of synthehol at the lounge. And yet, the Enterprise always seems clean.
So who or what cleans this stuff up?
From CGPgrey via the HI podcast.
RIKER: That isn't necessary. The ship will clean itself.– Xantec Oct 30 '15 at 02:56