针对建筑外墙瓷砖污垢产生的原因及物理化学性质，介绍了一种化学清洗该污垢的方法。
The cause of dirt and its physical and chemical properties as well as the cleaning method are introduced.
为了保证金属外墙的使用寿命，对此需要进行特殊的清洗和维护。
To ensure the long term value of a metal façade a specialised cleaning and conserving is required.
使用错误的清洗剂将会引起永久的损伤，并缩短外墙的使用寿命。
Wrong cleaning products can cause permanent damages and reduces the lifetime of the façade.
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