Sandstone cleaning & treatment

Description:

This London project records cleaning and treatment of an outdoor sandstone surface. The gallery includes before and after views and several photographs of the stone after cleaning, so the visible change can be judged from more than one angle. Outdoor sandstone collects soil and weathering in its texture and joints; cleaning can bring back a clearer view of the stone without making every old mark disappear.

A suitable treatment depends on the stone’s porosity, its previous coatings and how the area is used. The photographs document this particular surface, not a standard finish for all sandstone. Any remaining deep staining, erosion or physical damage would need separate assessment. For a similar exterior area, photographs of the whole surface and close views of the problem help establish whether cleaning, local repair or a further treatment is appropriate.