Black shower grout won't clean. DIY or call a profesional?« Back to Previous Page

That black grout is almost certainly mold, not just dirt. The high humidity and poor ventilation in older Bur Dubai bathrooms create a perfect environment for it to thrive. Bleach only removes the surface color; the fungal roots (hyphae) remain deep within the porous grout, which is why it returns so quickly.

For a DIY attempt, stop using bleach. Instead, use a dedicated, acid-based grout cleaner or a paste of baking soda and vinegar. Scrub it into the grout lines with a stiff brush and let it sit before rinsing. This can help reduce the visible growth, but it's often a temporary solution if the underlying moisture issue isn't resolved.

Given the persistent return and the building's age, this likely points to a deeper problem. The lack of effective ventilation means condensation is constantly soaking into the grout and possibly the wall structure behind the tiles. In such cases, a professional assessment is wise. They can use a moisture meter to check for hidden dampness and an inspection camera to look for mold growth behind the tiles, which is a common issue here due to our climate. If the mold has penetrated behind the tile, surface cleaning will never solve it, and remediation will be necessary to prevent structural damage and potential health impacts.