Restore brick, stone, and masonry with mild abrasive methods that raise soot, graffiti

https://www.mediafire.com/file/n8nejhr04rqktiw/pdf-82708-88430.pdf/file

Restore brick, stone, and masonry with gentle abrasive approaches that raise soot, graffiti, and efflorescence without harming the substrate, ready for sealing or repointing.