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16:00
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I watched the video about Tokyo subway cleaners [1]. There was the joke about Polish railway in the 90's and their cleaning procedure: 
-- Every wagon is cleaned and all dirt from today, current week and passing months is carefully removed. If dirt remained, it must have been dirt older than a year.
Today's situation is a much better and the rolling stock from 70's-80's was changed for modern one. But I was shocked seeing the Tokyo subway short after a rush hour. Wagons were clean with bright yellow upholstery illuminated by bright light like in a shop window. The only dirt in the wagon was a lost white shirt cuff button with a piece of white thread. 
There were also older subway lines and older wagons but I am thinking that mentioned video isn't exaggerated in no way. That procedure can't be implemented in any other country than Japan. 
[1] https://youtu.be/L90CpRdjMJU
17:30
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Continuing about cleanliness.
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I was surprised several times by the response of people from abroad visiting Poland, that what caught their eyes was that Poland was very clean. I don't think Poles think so and it seems to them that it is not so. Although since I started paying attention to it, I think that public spaces in Poland are often well-kept. Even though there are always exceptions to the rule.
I am often mentioning my abroad trip to the one of so called third world country (not in Europe). It was touristic trip by a coach through a whole country. We had a stop for some shopping and people were getting out to a street. There were garbages all around, with a quite big paint can laying on a lawn. I was observing while one person put the can on the base and put some crumpled paper into it. Every next person treated the can as an official garbage can despite it was in the center of untidy and cluttered space. 
-- Europeans - I thought. 
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But there are always two sides of the story. It's possible to meet homeless people in Poland whose odor is so intensive that it's hard to bear by a normal people. They are like medieval European people presented in Shogun novel by James Clavell, who refused to be washed, considering it harmful to their health. 
Tokyo homeless people which I saw were laying on a literally white blankets and were clean. Tokyo subway in a rush hours is smelling soapy and bath smells. It's not possible in Poland and other European countries I've visited.