1.天然石材都怕酸，外墙脏污也要拒绝使用草酸清洗，以免腐蚀石材、损坏石材；
1. All natural stones are acid resistant, and oxalic acid shall be refused to clean the outer wall for dirt, so as to avoid corrosion and damage to the stones;
2.外墙清洗属于高空作业，如果没有专业的高空作业资质以及保险，高空作业非常危险；
2. Outer wall cleaning belongs to high-altitude operation. If there is no professional qualification and insurance for high-altitude operation, high-altitude operation is very dangerous.
3.专业的石材清洗公司，懂石材，面对石材的各种污染有计可施，有高空作业相关证件，也有高空石材清洗的丰富经验，施工作业更让人放心、安心；
3. Professional stone cleaning company, understand the stone, facing all kinds of pollution of stone can be done, there are high-altitude operation related certificates, but also have rich experience in high-altitude stone cleaning, construction operation is more reassuring and reassuring;