Can I remove black shower grout myself or need a pro?« Back to Previous Page

Black shower grout in a JVC apartment is almost certainly mould, thriving on the soap scum and moisture trapped in your bathroom. The high humidity here, combined with shower steam and year-round AC use that cools surfaces, creates ideal conditions for it to grow.

For a small, recurring patch, you can attempt a more targeted DIY approach. Bleach only bleaches the surface and doesn't kill the roots. Instead, use a dedicated EPA-approved mould remover gel designed for bathrooms; the cling gel formula allows it to sit on the vertical surface long enough to penetrate the porous grout. Scrub with a stiff brush, not a sponge. Crucially, you must address the moisture. Run the bathroom exhaust fan for at least 30 minutes after every shower and keep the window open to cross-ventilate. Wiping down the wet tiles and glass after use also helps tremendously.

If the mould returns quickly after a thorough cleaning or covers a large area (over one square meter), the growth is likely deep within the grout or even behind the tiles. At that point, scrubbing the surface is ineffective. A professional assessment would identify the extent of the issue, and remediation would involve removing and replacing the compromised grout to properly eradicate the colony, followed by applying a mould-resistant sealant.