I need to recommend a cleaning method to remove asphalt soot from masonry - brick, limestone, and terra cotta. The building I'm working on is very near an industrial site where asphalt is made. The masonry was gently cleaned about 20 years ago when an addition was added. It already needs to be cleaned again, including the addition. Haven't found a good product that is gentle to the masonry, but will remove the oily asphalt soot. Any recommendations? thank you!
Grace A.M. Smith, RA, LEED AP
Designsmiths
616-866-4089