Oh, look, a spa pool!  Let’s each put our three million sweat glands, five million hair follicles and body parts not mentioned in polite company into it.  We could also put our heads under the water and add grease and dandruff from our hair, make-up from our faces and perhaps some saliva and nasal mucus.

Yes, let’s!  Then we can switch on the massaging air jets to help wash off some of the two grams of skin we shed each day and sit with the water up to our chins, inhaling the resulting aerosol for a quarter of an hour.  I can hardly wait!