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How to Stop Mould Coming Back on Silicone
You clean the silicone. It looks better for a few days. Then slowly, the black marks begin returning around the shower, bath, or sink again.
It’s one of the most common bathroom problems homeowners deal with, and unfortunately, cleaning alone often doesn’t solve the actual cause.
Mould returning on silicone usually means the sealant itself has started failing.
Why Mould Keeps Returning
Bathrooms naturally create heat, moisture, and condensation every single day. Over time, this constant exposure allows mould to develop around silicone joints, especially in poorly ventilated areas.
Once mould begins penetrating into the sealant itself, surface cleaning products may only improve the appearance temporarily.
Common causes include:
- poor bathroom ventilation
- ageing silicone
- trapped moisture
- damaged sealant
- low-quality previous application
In many cases, the mould is already embedded beneath the surface of the silicone.
Can You Clean Mould Off Silicone Permanently?
Surface staining can sometimes be reduced using specialist cleaning products, but deeply affected silicone often continues to discolour and deteriorate underneath.
If mould keeps returning quickly after cleaning, replacement is usually the best long-term solution.
Applying fresh silicone over existing mouldy sealant rarely works properly and often leads to the problem returning again.
How to Help Prevent Mould Returning
While no bathroom is completely immune to moisture, a few simple steps can help reduce future mould growth:
- improving ventilation
- opening windows after showers
- using extractor fans regularly
- reducing excess condensation
- keeping joints clean and dry where possible
Most importantly, replacing failed sealant early helps prevent moisture becoming trapped behind surfaces.
When Should Silicone Be Replaced?
Sealant replacement is usually recommended when:
- black mould keeps returning
- silicone is cracked or peeling
- joints are separating
- sealant looks permanently stained
- water may be reaching behind surfaces
Replacing deteriorated silicone not only improves appearance but also restores proper waterproof protection around baths, showers, sinks, and tiled areas.
Professional Bathroom & Shower Resealing
ROSEAL provides professional:
- Bathroom resealing
- Shower resealing
- Kitchen silicone replacement
- Commercial sealant services
across Somerset, Bristol, Dorset, Devon, Wiltshire, Hampshire, and surrounding areas.
We carefully remove failed sealant before applying premium-quality sanitary silicone designed for long-lasting performance and clean professional finishing.
