The cause of dirt and its physical and chemical properties as well as the cleaning method are introduced.

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。

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The cause of dirt and its physical and chemical properties as well as the cleaning method are introduced.

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。

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