Diedrich Technologies, a division of Hohmann & Barnard, Inc., specializes in revolutionary products for cleaning, restoring, and protecting new and historic masonry construction. They are the nation's leader in high-performance detergent products for building restoration and maintenance. Diedrich offers advanced masonry cleaning products specifically formulated to safely reveal the beauty underneath grime and paint, preventing mechanical deterioration of masonry surfaces. Their detergent processes are approved for cleaning buildings on the National Register of Historic Places and are ideal for historical restoration challenges. In addition to cleaning products, Diedrich provides technical support, on-site training, and nationwide distribution centers.