The selling proposition of a self-cleaning surface is obvious and in fact self-cleaning coatings for cars and windows have been around for years.

自洁式表面的销售主张相当明确不说，事实上汽车及窗户用的自洁涂层已经行之有年。

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Some of the earliest applications of nanomaterials have been in products such as stain-resistant fabrics, self-cleaning windows and harder-wearing tennis balls, but more and more are turning up in cosmetics and skin lotions such as sun-blockers.

ECONOMIST: The dulling of nanotech��s silver lining