I’m a bit disappointed that the animated depictions have sinks with ostensibly motion sensing.
I’d rather they had some unpredictable device; just off the top of my head, that could be like a chemical (or organism) that blorps out of the wall, envelops your hands (and presumably removes/eats debris or microorganisms or whatever) and then blorps back into the wall.
Alternatively, there’s just barely any hygiene at all. Star Wars is absolutely medieval/mythical/fantasy at least as much as it is scifi, if not moreso. The thought has definitely occurred to me that they just use something crude like outhouses. This isn’t Star Trek, it isn’t about futuristic solutions necessarily.
But it is about fantastical alien things, hence the blorping wall goo idea.