Cleaning the grout
The Tile Doctor grout colour change kit includes a pre-treater cleaner which is used to clean the grout joint and prime it ready for the colourant. The pre-treatment cleaner is applied and left so soak in for a short period before being scrubbed into the grout with a brush. This helps to penetrate below the surface, lifting any dirt and stains before being rinsed off with water.Changing the grout colour
After cleaning the grout, I applied the black colourant which is simply applied in thin even coats using a small brush. You need to take care not to get any on the tile and to wipe it off immediately if you do. The colourant sets quite quickly in around two hours but needs to be kept dry for twenty four hours.After the job was done, the change in colour left the wall tile with a whole new look - the one my client had hoped for to begin with. It’s probably difficult to appreciate this from the photographs but I was very pleased to have helped to remedy this problem quickly and with relative ease. Another happy client!
Source: Professional Tile, Stone and Grout Cleaning service in Sussex