Outdoor terracotta tile and cement grout cleaning.
Terracotta is very porous as well as cement. It loves water and spills etc which dive right into its makeup of the product. The cream tiles in these pics show "picture framing" like staining. We noticed directly above, the pitched roof ended exactly pverhead inline with the cream tiles and all the dirt, sap, other outdoor particulates would run off onto this area when it rained, which pooled and caused staining right through this very porous tile.
Also we found out this area used to be a swimming pool, which this patio had been built over. We also did its first clean since converted which was years and years ago.
Very important to keep on top of cleaning and maintenance of your outdoor tiles and grout.