What I am describing here is the smell of a very specific kind of public toilet. The ones in train stations and motorway service stations but also in every Café Nero or Costa in England. The smell is also sometimes in the toilets in pubs but not in all pubs, only the central London pubs that are really just thoroughfares for commuters.
You know the smell. It fills your nostrils all the way up. It’s sickly and sweet and smells more like human shit than actual human shit does because of how the smell of human shit lives inside it.