The blackened wall and balustrade on the south side of The Cleveland Museum of Art
The black film, mostly algae and bacteria, before treatment.
The same area after power washing but before JOS cleaning. Removing the black film revealed the discoloration beneath.
Conservator Marcin Pikus powerwashes the marble with hot water and D2.
In the second step of cleaning, McCartney uses the JOS system for removing stains.
More JOS cleaning and Rodin's The Thinker in the background.
The finished wall at The Cleveland Museum of Art.