@dagul and michel mills
in fact, in ancient time, chinese people have more hygiene level in asia even in the the whole world.
in about 3th century BC, the whole chinese social had shaped formally clean culture, the shower time have obviously standard, even every 5 days people have one holiday for shower time.
chinese hygiene level reduce a lot in recent century, parts for the qing dynasty's bad influence, parts for the bad country situation and bad living way.
but japan became good hygiene level after meiji period, korea's mordern development is more ealry and more rich than china too, that both improve the hygiene level.
Ps, today westerners who have high hygiene level today, even don't take a shower in amost whole life. one country must have better hygiene level when the country have better living way and richer.