Why does the acquired floor stain very easily?

The use of adhesives and cements in the course of the application generates construction waste on the surface which is not visible to the naked eye. These residues create a film on the highly absorbent ceramic which becomes increasingly difficult to clean over time.
To clean it, use HG Acid (for sale in DIY shops such as AKI, Maxmat or Leroy Merlin) or with DETERDEK from FILA (for sale in building material dealers) in the concentrations recommended by the respective manufacturers.