I am not aware of that aspect at all, but cleaning and cleanliness is in focus in general, from childhood, cities are more tidy even by look and the sight of the lady washing up (properly, with water, sponge, having a custom belt with containers for the tools and liquids used in the process) the sidewalk after cleaning up the poo of her dog is burnt into my retina.

Certainly there is a social pressure to clean and keep social order. It is one of those things that as multiple layers though, the streets are usually clean, people generally fall in line and don't make a mess but it does not mean everything is clean (like commercial kitchens).