The photographs below are of rough Chinese Slate floor tiles installed at a house in Dorchester; they had not been deep cleaned in a long time and the combination of pets and grandchildren had taken its toll on the floor. Rough Slate from China is a relatively inexpensive product and although long lasting and value for money the texture of the Slate is difficult to maintain and thus difficult to keep clean even if fully sealed
Cleaning Chinese Slate Tiles
To clean the tiles I used a strong dilution of Tile Doctor Pro-Clean which was left to soak into the Slate for a good ten minutes before working it in with a buffing machine fitted with a black scrubbing pad. This action removed the ground in dirt and any old sealer and a stiff brush was then run along the grout lines with more Pro-Clean to get them as clean as possible. The floor was then rinsed thoroughly and any stubborn areas retreated; a wet vacuum was used to extract the soiled water from the surface of the stone in order to get it as dry as possible.
Sealing Chinese Slate Tiles
The floor was left to dry overnight and I returned the next day to seal using three coats of Tile Doctor Seal and Go sealer which is a water based sealer (so no smell) that leaves a nice subtle shine to floor.
The slate and the grout looked really dull and dirty before we started and now the floor looks like it was recently laid.
For aftercare we don’t recommend the use of a Floor Steamer as they work on a 100 degrees and this damages the sealer; for regular cleaning use Tile Doctor Ph Neutral Cleaner using a two bucket system, whereby you apply the cleaning solution with a jug, wipe the floor and then squeeze off the excess into the second bucket, this stops you reapplying dirty water onto a clean floor..
Source: Slate Tile Cleaning and Maintenance Service in Dorset