A varnished / painted concrete floor in a plant room was not getting properly clean with various cleaning attempts. That's why Buzil was called in. There was mineral, organic and solvent-based dirt on the floor, which was already really encrusted. So our colleague first tried the acidic basic cleaner Buz Contracalc G 461 and a melamine pad. Thanks to the phosphoric acid contained in G 461, at least the mineral stains were removed. To get the floor really clean, however, the alkaline high-performance industrial cleaner  Indumaster Strong IR 45 was then used to clean the area again. And lo and behold: the floor is clean!