Recently cleaned a tiled kitchen floor which had been laid with Oyster Quartzite tiles, these tiles come from a fine grained rock formed from layers of clay and shale deposits producing a textured finish which although hard wearing can over time allow dirt to get stuck into the grooves.
To get the floor clean I used Tile Doctor Remove and Go mixed 50/50 with Tile Doctor Nano-Tech and then left it for an hour to soak. after this time had elapsed I used a Spinner rotary pressure cleaning tool followed with a Wet Vacuum to clean and remove the old sealer and dirt.
The effect was very pleasing to the eye but the process does require the use of a lot of water though so prior to starting I used clear silicone to secure the kitchen unit kicking boards and avoid water ingress into the wood.