Clean what's outside without cleaning what's inside.
If cleanliness is next to godliness, then it's no surprise Medbay has a room above the Medbay Operating Theater in its rough center dedicated to precisely that, called the Medbay Restroom. That said, given the poster here, perhaps this godliness is really dedicated to not a deity, but profits...
Anyways, this restroom has two stalls, complete with real toilets and (purely-aesthetic) toilet paper rolls, and a fancy wash room outfitted with both a bathtub and a shower. Said washroom also has this neat lil' foyer room with a bin full of towels, appropriate post-bath gear, and a washing machine (like in Space Japan!), so you can insert your dirty laundry into it, take a shower/bath, and then finish up to find some fresh, clean clothes waiting for you--wonderful! Unlike the Research Restroom and public Bathrooms, these have stall doors you can lock and unlock via right click, so no one can walk in and discover that you bathe with your clothes on.
This room also has two sinks for washing your hands and removing any visible stains from clothing. Next to it is a space cleaner spray bottle, a sponge, and bottles of ammonia, acetone, and more space cleaner, so you can clean up Medbay and other places too when the Janitors are too busy.
There is no vent. That doesn't help clean things!
The APC for this room is on the left wall, near one of the sinks.