Is black shower grout a DIY fix or professional job?« Back to Previous Page

Black shower grout in a Deira apartment is a classic sign of a persistent mould issue, exacerbated by Dubai's high humidity and your bathroom's lack of ventilation. The musty smell confirms active growth.

Bleach is a temporary fix. It bleaches the visible colour on the surface but often fails to kill the roots embedded deep within the porous grout. The mould will almost always return within days or weeks because the underlying moisture problem isn't solved.

For a DIY attempt, stop using bleach. Instead, use a dedicated, non-bleach mould remover containing antifungal agents. Scrub it in thoroughly and, crucially, improve ventilation. Run the bathroom's exhaust fan for at least 30 minutes after every shower and consider using a portable dehumidifier. If the grout is cracked or deteriorating, moisture is trapped behind it, making a DIY fix unlikely to succeed.

Given the musty odour and the fact it's recurring despite cleaning, this is likely a professional job. The mould may have spread behind the tiles. A professional inspection can assess the extent of the problem using moisture meters and, if necessary, lab testing to identify the species. Remediation would involve removing the compromised grout, treating the underlying area, and re-grouting with a mould-inhibiting product. The only permanent solution is to control the humidity, which in a windowless bathroom requires a consistently functioning and powerful extraction system.