The window cleaning device which was patented in 1903 is the oldest.

雨刷在1903年获得专利，是最古老的汽车配件。

Plus, they're an energy-free alternative to other air cleaning devices. In other words, a truly green solution.

而且，这种方法是可以替代其他空气清洁设备的零能源方法。换言之，这是真正的绿色解决方案。