These photographs of a Terracotta tiled floor came from a house in Melbourne Market Harborough, as you can see the tile was looking tired and the grout had gone dark with staining.
Cleaning Kitchen Terracotta Tiles
Before starting work the tile perimeter was protected using plastic sheet. Next I could see the floor had been sealed previously but was now looking patching where the sealer had worn off in the high traffic areas and so to get a consistent look to the tile it would be necessary to remove it and strip the floor back to its original condition. To remove the old sealer I used a dilution of Tile Doctor Remove and Go which was left to soak into the tiles for about 10 minutes before being worked in with a rotary machine fitted with a black scrubbing pad. The grout also needed attention so this was scrubbed by hand using a grout brush. The soiled cleaning solution was then removed using a wet vacuum and the floor rinsed; it was apparent at this stage more work was need so the stubborn areas were re-treated using the same process and when I was finally happy with the results the floor was rinsed thoroughly and the wet vacuum was used to get the floor as dry as possible.
Sealing Kitchen Terracotta Tiles
The floor was left to dry overnight and we returned the next day to re-seal the tiles. After discussing the options with the house owner we went with Tile Doctor Colour Grow which is a penetrating sealer that fills the pores of the tiles enhances the colour in the process. The grout cleaned well and that combined with the new natural look to the Terracotta the floor looks new again.
Source: Residential and Commercial Terracotta Tile Cleaning Services in Leicestershire
Now I would normally use Seal and Go on Terracotta as it gives it a nice shine, but Colour Grow definately give a more subtle and natural finish.