The grout on this Quarry tiled floor in the kitchen of a house in Livingston near Edinburgh was proving impossible to clean effectively and had now become badly stained with dirt and grime and had gone dark in the process making it obviously dirty when compared with the clean areas.
Cleaning Tile and Grout
The first step when cleaning grout is to apply a strong solution of Tile Doctor Pro-Clean which is a strong alkaline cleaning agent. The solution is mopped onto the tile and grout and then scrubbed in by hand with a stiff brush along the grout lines, Pro-Clean is also a good general tile cleaner so it worked well on the Quarry Tiles as well. The soiled cleaning solution was rinsed away with water and as much water as possible was removed using a wet vacuum. Next we left the floor to allow it to dry leaving a turbo air mover in help to speed up the process.
Sealing Quarry Tiles
When the floor was dry it was clear that the grout would never be clean enough to match with the areas that were still white so we agreed to apply a white epoxy Grout Colourant to resolve the problem. The group colourant is applied by hand and is painted onto the grout using a small brush; any excess is then wiped off the tile. Two coats were required on this floor.
The floor now looks like it has come back to life and as you can see all the grout now has a uniform colour and should stay that way for a long time as the added advantage of an epoxy grout colourant is it forms a barrier over the grout that will seal and protected it.
Source: Tile, Stone and Grout Cleaning and Sealing in Edinburgh