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Cleaning best practice
The short answer
Grout is porous, so it should be cleaned with an appropriate product and dwell time, then sealed, rather than scrubbed harder each time.
Grout darkens because it absorbs. Scrubbing removes the surface layer and a little of the grout with it, which is why aggressively cleaned grout gets dirty faster each time.
How it is done
- Apply the product and let it dwell; pressure is not a substitute for time.
- Use a stiff nylon brush, never a wire one.
- Rinse thoroughly, because residue in a porous joint attracts new soil.
- Seal once the joint is dry, and re-seal periodically.
Why it matters
In UAE bathrooms, hard water leaves mineral deposits in the joint alongside organic soil, so grout often needs both an alkaline and a scale-focused step rather than one product doing everything.
questions
Asked about this
No. It is often mineral staining or absorbed soil. Genuine mould in silicone or grout usually looks black and spotted rather than uniformly grey.
Yes, and for old or crumbling joints it is often the better answer. It is a finishing job, not a cleaning one.