I've just remembered a disgusting smell.
Some years ago I wanted a hair cut and on a whim walked into a salon. It was an old fashioned hair salon, but that didn't bother me as I only wanted an all over trim, not a restyle.
I didn't even need to have my hair washed as I didn't want to be too long in there and it could just be dampened down if they wanted to.
A very nice young girl sat me down, put the cape around me, combed through my hair, discussed the trim and then she picked up a spray bottle....
Lordy! Lordy! It was stagnant water! No wonder they were so lovely and accommodating to me,they couldn't have had a customer in ten years!
The water was absolutely rank, I was nearly heaving at the pong!
I had to explain to the lady, and the other lady in the shop who was the owner that water stagnates! They were genuinely shocked.
I had to have my hair washed, but I can still recall that disgusting smell to this day.