Do this to get dirt out of the pits in your porcelain tile

Job History
This tile had a large build up of dirty, and grease and general dirt that needed to be removed as it made the floor look unsightly. This client asked if we could help with the issue as it had been getting progressively worse due to the environment and the lcoation of these tiles. Due to hand dryers and the way to walk ways we lots of water would sit in this area and as a result when it dried, the film scale is left behind.
Client Requirements
The customer required the following from the contractor
1) To restore the porcelain tile back to a good condition
2) Removal dirt and stains and restore the tiles original colour.
3) Help advise and implement a cleaning regime to keep the tiles clean moving forward.