This unusual Emery and Cie Cement Encaustic tiled floor in Ealing W5 had been poorly installed by the tiler with grout haze on the tiles and the wrong sealer used. Cement encaustic tiles are quite delicate and difficult to restore.
Cleaning Semi-Riven Slate Tiles
I used a red burnishing pad fitted to a buffing machine to cut into the tile surface and remove the grout haze and old sealer. The next step was to apply a dilution of Tile Doctor Pro-Clean letting it soak into the tile before working it in to the tile with a red buffing pad. The soiled cleaning solution was then removed using a wet and dry Vacuum and the floor washed down with clean water. This cleaned up the floor well but there were some stubborn stains which were removed using a steamer.
Sealing Semi-Riven Slate Tiles
Once the floor had dried it was sealed using three coats of Tile Doctor Colour Grow which is a colour intensifying sealer that provides durable surface protection. Last step was to burnish the tiles again with a green burnishing pad to bring up the shine.
Although the floor had been too damaged to be made perfect, it was very much better when I had finished and the customer was delighted with the result.
Source: Cement Encaustic Tile cleaning in Ealing