CT 51 is strongly viskose alkaline detergent assigned for a depth cleaning of internal and external stone surfaces (sensitive on acids) as a marble, natural stone, limestone, sandstone, travertine,...,artificial stone and cement products. Excellent for removing greases, mold, algae, mosses and dirt that atmospheric pollution is bringing. Assigned for depth renewal cleaning for old stone masonry products like portals, window frames, statues and other masonry products. CT 51 can also be used for removing old coatings - old manner of protection (burned or raw oil, waxes) from "cotto" floors, bricks and terazzo floors.