At what point in the shower? Maybe there could be a drain based sensor that would tell you you're clean enough -- like how some dishwashers work?
Ever think there could be one spot on your body you've never actively cleaned, it has a unique bacterial signature from that time as a child you sat on a recently crushed meteorite, it's the sole remaining life from an alien World! No, just me then.
Ever think there could be one spot on your body you've never actively cleaned, it has a unique bacterial signature from that time as a child you sat on a recently crushed meteorite, it's the sole remaining life from an alien World! No, just me then.