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2. Soft washing - Wikipedia

   en.wikipedia.org/wiki/Soft_washing

   Soft washing is a cleaning method using low pressure water. More recently, the term "softwashing" has been used to describe any form of spraying chemicals at buildings where solutions (typically sodium hypochlorite based softwashing chemicals) are used to remove mildew, bacteria, algae and other organic stains from roofs and other building exteriors.

3. Roof cleaning - Wikipedia

   en.wikipedia.org/wiki/Roof_cleaning

   Using a pressure washer, or any other gas powered device, to clean a roof at more than 100 PSI can damage the roof. The U.S. based Asphalt Roofing Manufacturers' Association specifies the use of a bleach cleaning solution, without the use of a pressure washer, to remove algae from a roof. ARMA discourages the use of a pressure washer, a flat ...

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5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Air cleaning and filtration should be taken in account when protecting our building environments. [42] If present, contaminants can come out from the HVAC systems if not removed or filtered properly. Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space.

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7. Drilling and blasting - Wikipedia

   en.wikipedia.org/wiki/Drilling_and_blasting

   Drilling and blasting is the controlled use of explosives and other methods, such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock cut.