Re: A question for connoisseurs...
"Given that the 'tap' that produces the water jets and the air vents are in a place that is extremely likely to be in frequent contact with faeces and urine, and given that said vents and water jets have mobile parts and (ehemm) orifices -where bacteria and organic matter can accumulate and reproduce"
They are designed not to have crevices and they have an auto clean cycle after every use.