Selected Answers

From Tom Schwerdt of Active Transportation Advocates on July 14, 2021:
I would first look at using pelletized dry ice bla ...read more I would first look at using pelletized dry ice blasting.

From Andrew Piedl of Steven Winter Associates, Inc on July 13, 2021:
I've worked on several projects where chemical str ...read more I've worked on several projects where chemical strippers were used with success. Damaging the brick or whatever type of masonry (not just the mortar, which can be replaced by repointing) is of equal, if not greater importance. Testing is critical; you may consider referring to NPS Technical Brief 1: https://www.nps.gov/tps/how-to-preserve/briefs/1-cleaning-water-repellent.htm

From Jon Cavallo of Jon R. Cavallo PE LLC on July 9, 2021:
Sponge-Jet white (non-aggressive) media has been s ...read more Sponge-Jet white (non-aggressive) media has been shown to work in this application. I suggest that you contact Sponge-Jet for details and case histories.

From Tim Greene of S&ME on July 8, 2021:
Vapor or dry ice blasting ...read more Vapor or dry ice blasting