Obviously the inventors of this stuff have realized that no amount of scrubbing will clean grout, so painting it becomes the next best option. The pen is like a big white highlighter with a white paint that readily covers the grout.
Sparkle (20-295) - Graham and Brown Wallpapers - Glitter embellishments have been used to accentuate the grout line creating a sophisticated and stylish small scale tile effect. Black brick vinyl wallpaper - darker than image, please request a sample for true colour match. Other colour ways available.