Bathroom Mould: Why It Keeps Coming Back and How to Stop It

If mould keeps coming back to the same spot in your bathroom no matter how often you clean it, the cleaning isn't the problem — the conditions are.

Ventilation Is Usually the Root Cause

Mould needs moisture to thrive. A bathroom without proper extraction, or one where the fan isn't run long enough after showering, will keep growing mould regardless of how clean it starts.

Surface Cleaning Doesn't Reach the Spores

Wiping visible mould removes what's on the surface but often leaves spores embedded in grout and silicone, ready to regrow within days.

The Fix Is Usually Two-Part

Treat existing mould with a product designed to kill spores below the surface, then address ventilation — running the exhaust fan for at least 20 minutes after every shower makes the biggest long-term difference.