华盛顿广场的杰斐逊纪念馆大厦年久失修,建筑物表面斑驳陆离,后来还出现裂痕。政府虽然采取了很多措施。但仍无法遏制,于是派专家调查原因。调查结果是:冲刷墙壁所用的清洁剂对建筑物有酸蚀作用。而该大厦墙壁每日被冲洗的次数,大大多于其他建筑,受酸蚀损自然严重。 Jefferson Memorial Building in Washington Square, a long time disrepair, building surface mottled, and later also cracks. Although the government has taken many measures. But still can not contain, so send experts to investigate the reason. The result of the investigation is that the cleaning agent used to wash the wall has an acid etching effect on the building. The number of daily flushing of the building’s walls is much larger than that of other buildings, and the acid erosion is naturally serious.