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Causes of building surface to clean
Outer walls of buildings, roofs and doors and Windows blocked the influence of natural environment on the inside and erosion; while the external walls of buildings to withstand natural erosion of the most serious, weather-beaten, first, the Sun's radiation. For any materials, pollution and erosion caused by long-term exposure of sunlight is an important external reason. UV harmful rays, the Sun high temperature and temperature difference resulted in the building of the four seasons under surface materials aging, dull, vulnerability to pollution. For example, the corrosion of metal and plastic composite materials ageing; cracking of cement materials; exterior paint color loss. Sun exposure is inevitable, is the direct cause of pollution from external walls of buildings. Second wind and rain erosion. For high-rise buildings, this is even more serious, as high as possible. Dust in the wind, dust, rain and snow is also possible with hail. Sand, snow or rain erosion in addition to damage to the material, then necessarily leave traces on the surface of buildings, water clinging to the solid dirt. Such as the high-speed collision of flying insects, birds and droppings.
Industrial modernization has also aggravated air pollution. Especially in large cities, vehicle exhaust and industrial emissions standard, increased carbon dioxide and sulfur dioxide in the air, commonly known as acid rain, causing local erosion of the strong appearance in the building, showing buildings in front of you rusty.
The adhesion of dirt on the exterior wall, based firmly on the surface of a building under normal circumstances, because the combination of loose dirt is washed down by rain, the rest of the dirt can be broadly divided into the following categories:
Coulomb force with a wall of dust
By organic matter from sticking to the walls of dust and paper scraps leaves dirt and other solids;
High speed flight crashes into the wall, and glue in the wall after the death of insects, birds, wrecks;
Air pollution, rust on the surface of the outer wall; containing organic and inorganic salts left by rain water;
The rainwater from the roof left carrying the dirt.
Above dirt because of different kinds combine forces and combined in different ways, deposited on the outer walls at different times, so cleaning up in very different ways, facades cleaning agents made a series of technical requirements:
0 1 effectively wash on the external walls of buildings of all kinds of dirt without damage to exterior wall material, do not leave traces;
0 2 suitable for use washing machine, in a short time a good cleaning effect, low concentrations;
0 3 cleaning external wall there is a washing effect, at least without doing damage to doors, Windows and glass materials;
0 4 detergent costs lower, cleaning costs are not high.
0 5 after cleaning do not cause pollution to the environment around, cleaning waste water without treatment to meet emissions standards.
To meet this requirement, facades cleaning agent surfactants and additives prepared with water-based detergents, use blending to a certain concentration (critical micelle concentration). Special cleaning of dirt on the exterior wall, according to General heavy dirt marks on hard surface cleaner design, you might consider adding organic or inorganic solvent, mixed with acidic detergents, used to scrub the local asphalt staining, adhering dirt and rust. Should generally be local building cleaning before cleaning.

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