Masonry Magazine June 2007 Page. 27
Cabela'o
Not all manufactured stones are created equal. Six of the eight types of stone on this building are integrally colored and could stand up to a vigorous cleaning. The remaining two get their color from an applied surface coating that would have been bleached out from a vigorous cleaning. The cleaning contractor discovered the difference in testing and cleaned the building successfully.
Photo courtesy of Christensen Spankwhindeational
Christensen completed further tests until a satisfactory method was achieved. After his shop tests, Christensen field-tested his cleaning procedures on an out-of-the-way spot of the Cabela's wall, in the same conditions in which he planned to clean.
PROSOCO
The knowledge gained from testing guided Christensen to a successful job. It was a project that could have easily tripped up someone with a more casual approach. Always test, and always clean under the same conditions in which you tested.
3. Use the Mildest Cleaner and Dilution That Still Gives Effective Results
BECAUSE CONCRETE MASONRY has some of the same components as the mortar films and smears that have to be removed, cleaners for concrete masonry are gentler than those for clay. The best concrete and manufactured stone cleaners are precisely balanced-just strong enough to dissolve films and mortar smears that aren't fully hardened, yet safe enough to do so without harming the masonry.
On a building that combines clay and concrete masonry, the cleaner made for clay might harm the concrete masonry, unless you take precautions. However, if you cleaned the building early enough - before the excess mortar has fully hardened the same gentle cleaner and dilution that's safe for concrete will also effectively clean the clay brick.
Which brings up rule number four - clean early and quickly.
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June 2007
Masonry 25