This Porcelain hallway and kitchen floor in Teddington, Middlesex, had extensive soiling in the grout lines and some staining on some of the Porcelain tiles from drink spillages. Porcelain is very robust material but like any surface the sooner you clean-up a spillage the less staining you are likely to experience.
Cleaning Porcelain Tile and Grout
To clean the tile and grout I applied a dilution of Tile Doctor Pro-Clean, which is an effective Tile and Grout cleaner, with a mop and left it to soak in for a while before working it into the floor using a rotary machine fitted with a black scrubbing pad and a stiff brush along the grout lines. The soiled cleaning solution was removed using a wet vacuum and rinsed down with clean water. This process was repeated until I was satisfied the tile and grout was clean.
I then waited for the floor to dry before applying a coat of Tile Doctor Grout Sealer to the grout lines in order to help make future maintenance easier, this type of Porcelain did not need sealing so only the grout would benefit from this preventative measure. The process is very straightforward and can be sprayed onto the grout line wiping off the excess from the adjacent tile within a few minutes.
I think you will agree from the photographs that the grout which was very prominent has now almost disappeared restoring the floor to its original appearance.
Source: Deep cleaning Porecelain and Tile Grout in Middlesex