test clean Jefferson memorial - biofilm.

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Jefferson memorial - Laser Cleaning

Laser ablation was chosen as the method of removing the grime because it is not harmful to the stone like chemicals or a pressure washer might be, the National Park Service said. The use of laser is also an environmentally friendly procedure in comparison to more abrasive cleaning methods, the National Park Service said. Conservation of Sculpture and Objects Studio, Inc., a Chicago-based conservation firm, conducted the laser cleaning.