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Removing dirt

Most dirt on concrete surfaces can be removed with plain water or with a soft brush and water containing a mild soap. If a stronger solution is required, use one part of hydrochloric acid with 19 parts of water.

In addition, steam cleaning or water jetting are generally effective methods of removing dirt.

 
Acknowledgement: The Concrete Society
 

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Visual Concrete: Weathering, stains and efflorescence