(A) Abrasive cleaning methods, although a quick way to achieve results, will cause severe damage by eroding the protective surface of a masonry building. Once the protective surface is removed, the exposed material will be highly susceptible to rapid deterioration. It is suggested that professionals be consulted if building materials need to be cleaned.
(B) Design guidelines.
(1) Use the gentlest means possible cleaning a building. A test patch will determine the cleaner’s effects on the material.
(2) Never sandblast or use other strong chemicals on masonry or wood buildings.
(3) Protect surrounding buildings that are not being cleaned.
(Ord. 14, 2011, passed 10-3-11)