The pictures below are of an Indian Fossil Sandstone tiled floor at a house in the small town of Hessle which as you can see was in a need of a deep clean and seal. The tiles themselves where in good physical condition with no cracks, just a lack of sealer and a heavy build up of dirt.
Cleaning dirty Flagstone floor tiles
I started the job by dealing with some unsightly cement splashes that had been left around the grout lines, breaking them down manually using a good old fashioned hammer and chisel.
Once that was taken care of step one was to mix a solution of one part Tile Doctor Pro-Clean to four parts clean water, applying it to the tiles and scrubbing it in with a black pad fitted to a rotary machine. The second step involved rinsing the floor with Tile Doctor Neutral Cleaner to neutralise the floor and remove any trace of product used to clean the surface. This process removed the ingrained dirt caused by a lack of sealer and clean the area ready to receive a fresh seal.
Sealing the Flagstone tiled floor
I left the property to allow the floor to dry over night. Upon my return the next day, I checked for excess moisture and, once satisfied the floor was dry, I proceeded to seal the floor with four coats of Tile Doctor Seal & Go. Seal & Go is a water-based topical sealer designed to build up stain resistant protection on the surface of the floor and to allow moisture vapour transmission. It is typically used to seal internal, unsealed porous surfaces, including Sandstone, Quarry and Victorian tiled floors.
Source: Sandstone Tile and Stone Cleaning and Sealing Service in Yorkshire