This small rough Chinese Slate floor in the kitchen of a house in the village of Cheadle near Stockport in Greater Manchester had not had any sealer put on it for many years and was very grubby (dishevelled as described by the customer) looking even after the customer had tried to clean it.
Sealers do take a lot of punishment, especially in a high traffic area such as a small kitchen and will wear off over time and once this happens the floor will start to lose its appearance as dirt becomes ingrained in the stone and it can no longer be cleaned effectively.
Cleaning the Slate Tiled Floors
As we have to apply a liberal amount of water with this sort of work, the first step was to remove the Kicker boards at the bottom of the Kitchen units and silicone the Kitchen units that were fixed; this stops water seeping in and blowing the MDF allowing us to concentrate on cleaning the Slate without causing any damage.
I started the cleaning process by applying a strong dilution of Tile Doctor Pro-Clean to get rid of the built up dirt and any remaining sealer, leaving it to soak into the Slate before scrubbing the floor with a black scrub pad fitted to buffing machine running at slow speed. Tile Doctor Pro-Clean is a strong alkaline cleaner/stripper that is safe to use on natural stone, we do have stronger products available if required but in this case a strong dilution of Pro-Clean was sufficient to tackle any remaining sealer.
This process gave the Slate and grout lines a good deep clean and after rinsing the floor with water which was then extracted using a wet vacuum I repeated the process on stubborn areas until satisfied the floor was as clean and free of old sealer. Last stage of the cleaning process was to give the floor a final rinse and then get it as dry as possible using the wet vacuum to soak up the moisture.
Sealing Riven Slate Tiles
The floor was quite small so I was able to leave the floor to dry off over lunch time and then on my return managed to get it fully dry with a little heat from a heat gun. The customer wanted a mat finish so once dry I applied Tile Doctor Colour Grow sealer which impregnates into the pores of the natural stone protecting it from within and enhancing the natural colours of the Slate at the same time.
For general cleaning of Sealed stone floors, we recommend the use of a PH Neutral Cleaner as anything with a strong PH will degrade the life of the sealer over time.
Source: Slate Tile and Grout Cleaning and Sealing Service in Greater Manchester
Steve Keary is an agent of Tile Doctor, the largest Tile and Stone cleaning network in the UK who have developed the products and techniques to handle a multitude of issues surrounding tiled flooring including stone and grout.