I think there is a difference between wee and the fluid expelled when one's water breaks; Particularly in relation to the odor.
Yes, wee smells a hell of a lot better. Amniotic fluids smells mire of a minus, definitely more unpleasant.
It’s not that hard, sponge it with hot soapy water, wash it over with wool wash, spray with a spray that’s meant to get animal wee smell out of stuff then stick out in sun to dry. It will be fine. Been there, done that.
Can’t believe host did not have a protector. It’s common sense. What if a guest had a period leak?
I had two occasions where I was very sick, physically could not get out of bed, one of these times ended in hospitalisation. Wet the bed, was sick on it (missed bucket) and had liquid diarrhoea. As I said, ended up being hospitalised, was that ill. Anyway, with the above method our mattress ended up fine, no smell. We ended up getting a new mattress, due to age of the old one no other reason and first thing I did was a good quality, cooling, no sweat waterproof protector.