The external walls of high-rise includes cleaning engineering:

High-rise building outer wall cleaning, high glass curtain wall cleaning, high plastering wall height, the installation of advertising. Because of the high level of external danger exists and complexity, so this work is a considerable degree of scientific and professional.

Building on the external walls, roof and windows blocked the natural environment impact on the construction of internal and external walls of buildings are subjected to erosion; and natural erosion is most serious, have experienced years of wind and frost, the first is the sun. For any materials, long-term exposure of sunlight is one of the most important external causes of pollution and erosion. Ultraviolet ray very harmful, high temperature and the temperature difference between the four seasons sun and caused the building surface material aging, loss of luster, vulnerable to pollution. For example, aging, corrosion and plastic composite materials of metal materials; cracking of cement material; exterior wall paint color off. The sunlight is inevitable, is the direct cause of the external walls of buildings caused by pollution. The second is the wind and rain erosion. This pair of high-rise buildings is more serious, taller wind is big. The wind with dust, dust, rain and snow is also possible with hail. Wind rain and snow in the scouring of injury and material damage, and the surface of the building must leave traces, adhering to the surface of solid dirt in the water. For example, high-speed collision of flying insects, birds and feces.

Industrial modernization also aggravated the pollution of the atmosphere. Especially in the metropolis, the excessive emission of automobile exhaust and industrial emissions, the air in the two oxidation carbon and sulfur dioxide increased, commonly known as the city of acid rain, causing local strong erosion in the appearance of the building, to show in front of you buildings rusty.