The new mayor is determined to clean up the city.

新上任的市长决心要整治好这座城市。

《牛津词典》

The centre of the city is spotlessly [stainlessly] clean.

市中心一尘不染干干净净。

《新英汉大辞典》

Mexico City is home to both the world's richest man and to people who lack clean water, and their paths seldom cross.

墨西哥城是全球首富的故乡，也是缺乏干净水之人们的故乡，但他们的日常生活很少有交集。

youdao

And many say the beleaguered nation is soon to have the first capital city without any clean drinking water.

VOA: standard.2010.04.01

The city is so clean.

CNN: 10 Questions For Michael Bloomberg

The city you find yourself in is all clean lines and shadows, and visually very distinctive, in a pure but attractive kind of way.

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But the best testament to how clean and green Copenhagen really is can be found in the heart of the city.

BBC: Living green in Copenhagen