A pressure washer or power washer is a high-pressure mechanical sprayer used to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The volume of a pressure washer is expressed in gallons or litres per minute, often designed into the pump and not variable. The pressure, ...
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http://en.wikipedia.org/wiki/Pressure_washer
Works by adding power to the flow of water, forcing an output with a high dynamic pressure. Water is expelled with such power that is can remove dirt, mould, mud, and many other layers of unwanted build up. It can clean a variety of objects and surfaces including garden furniture, tools, guttering, decking, wooden fences, bricking, patios, and walk...
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https://www.tigersheds.com/thehiphorticulturist/a-glossary-of-gardening-too
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