This newly installed Herringbone-style Terracotta tiled floor in a refurbished kitchen was heavily covered with patches of grout haze. The customer, who lives in the town of Cogenhoe, Northampton informed me that the tiler had supposedly sealed the floor before grouting. If this was true, the grout haze should have been very easy to remove.
However, the tiler had clearly not been entirely truthful as, when I arrived at the property to carry out a test clean, I found very little evidence of any sealer whatsoever. Nonetheless, I found that the grout haze was easily removed using a solution of Tile Doctor Grout Clean Up, a concentrated phosphoric acid cleaner which is designed specifically for the removal of haze, mineral deposits and efflorescence.
These Terracotta tiles were very pitted and the original tiler was correct to fill the small holes with grout to complement the rustic look of the tiles, but he should have taken the correct measures to ensure that a white misty grout haze didn’t appear over the whole area!
The customer was happy for me to proceed with restoring the floor, but also very concerned that her newly installed hand painted kitchen units would be damaged by the chemical cleaning products. I assured her that I would cover them up completely and carry out all work along the plinths by hand.
Removing Grout Haze from Terracotta Tiles
Once on site, I covered the kitchen units to protect them and proceeded to mix up a solution of Grout Clean Up. This was applied firstly around the edges of the floor and scrubbed into the stone by hand using a stiff brush.
Working in areas of four square metres each so as to not the leave the product on the floor too long, I applied the solution to pre-wet the floor ready for the next part of the process. This was to apply Tile Doctor Acid Gel, our blend of phosphoric and hydrochloric acids, leave it to dwell for a few minutes has then agitate it to neutralise and remove the copious grout haze. Once each area had been treated I rinsed it with water to remove any chemicals.
Sealing Terracotta Tiles
With the entire floor treated, I installed a dehumidifier to help the tiles to dry quickly overnight. The next day I returned to the property to apply two coats of Tile Doctor Colour Grow sealer. This is an impregnating sealer which provides robust protection while also lifting the natural shades in the Terracotta.
Each coat was polished in by hand, leaving an hour for drying between coats. I then waited another hour before giving the whole floor a final polish with a buffing machine to remove any excess sealant.
The result achieved in the space of 24 hours was fantastic and the customer was exceptionally pleased. Despite the severity of the grout haze problem, the combination of the right products allowed me to handily resolve it. The addition of a properly applied and top quality sealer will help to ensure the floor is protected from staining, something which is essential in a kitchen.
Source: Tile and Grout Cleaning Service in Northamptonshire