Remove dirt and dust with a damp cloth
Divide your tiled floor or wall into sections
Spray on the grout cleaner, leave for 10 minutes
Scrub the area with a dry toothbrush/grout tool
Wipe clean with water and a cloth
Repeat if needed
If your grout is discoloured it may be time to grab an old toothbrush and get scrubbing.
It’s not the nicest chore, but sparkling clean grout will have your bathroom looking like new.