Why Your Silicone Keeps Going Mouldy

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You've cleaned it, you've bleached it, you've scrubbed it raw, and within weeks the black mould is back in the silicone around your shower. It's one of the most frustrating problems in any bathroom, and the cause is almost never what people think.

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Why Mould Keeps Coming Back

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Once mould has taken hold inside silicone, it's there for good. Mould doesn't just live on the surface, it grows into the porous structure of old or low quality silicone. No amount of cleaning, bleach or scrubbing can fully remove it. You can lighten the colour temporarily, but the mould remains underneath, ready to return.

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The Real Cause of Mouldy Silicone

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Three things cause silicone to grow mould faster than it should. Low quality, non mould resistant silicone that wasn't designed for wet areas. Poor application, leaving gaps where water sits and bacteria thrives. And missing or failed waterproofing behind the silicone, allowing moisture to feed mould growth from the wall side.

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Why DIY Silicone Replacement Often Fails

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Replacing silicone yourself sounds simple, but most DIY jobs fail within months. Common mistakes include not fully removing the old silicone and mould residue, applying the new silicone over damp surfaces, using bathroom sealant instead of proper neutral cure mould resistant silicone, and leaving inconsistent bead thickness that traps water.

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The Permanent Fix

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The only real solution is complete silicone removal, surface preparation, and reapplication using professional grade mould resistant silicone designed specifically for high moisture areas. Applied correctly, quality silicone will last 7 to 10 years without going mouldy, even in the most heavily used family bathrooms.

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When to Call a Specialist

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If you're cleaning your silicone every week and it's still going black, it's not a cleaning problem. It's a replacement problem. A professional silicone replacement takes a few hours and gives you years of clean, fresh, mould free finishes. Stop fighting the problem on the surface, fix it at the source.

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