Removing mould from silicone is possible using several cleaning methods; however, in many circumstances, to effectively remove mould from the silicone, it needs to be cut out and replaced. If you’re unsure about the best method, consider our professional mould removal services for assistance.
Understanding Why Mould Grows on Silicone
Silicone is commonly used to seal joints in wet areas to prevent water from making its way into areas that need to stay dry. Given that mould growth thrives in areas with high moisture, it is no surprise that you are trying to find ways of how to remove mould from silicone. Learn more about why mould grows and how to prevent it.
A Step-by-Step Guide to Removing Mould from Silicone
Before attempting to remove mould from silicone though, it is crucial to wear the proper personal protective equipment (PPE). Here are some essential PPE items to consider:
- Disposable P2 Mask or Respirator: To protect your respiratory system.
- Gloves: To shield your hands from direct contact with mould and cleaning chemicals.
- Safety Glasses: To protect your eyes from mould and any cleaning solutions.
- Disposable Overalls: To keep your clothes and skin protected from contamination.
If you’re unsure about handling mould safely, check out our mould safety tips for more guidance.
Option 1: Cleaning Mould off Silicone
If the mould on the silicone is sitting on a layer of biofilm and has not yet penetrated the substrate, it is possible (whilst not desirable) that you can clean the mould off the silicone with one of the following cleaning solutions:
Using a spray bottle filled with your desired cleaning solution, spray the mould-affected silicone, allowing it to sit for 5–15 minutes. Using a rag, microfibre cloth or scrubbing brush, gently scrub the mould and apply more cleaning solution when required.
If the mould has been successfully removed following this procedure, ensure you monitor it for future growth. In nearly all instances when you attempt to clean mould off of silicone, it will return within a matter of days. Consider scheduling a mould inspection to identify the underlying cause.
Option 2: Removing and Replacing Mould-Affected Silicone
The best way to remove mould from silicone is to physically remove the silicone along with the mould. If the task feels overwhelming, you can always contact our team for expert assistance.
What You’ll Need
- Silicone sealant remover (optional but helpful)
- Utility knife or razor blade scraper
- Plastic scraper or silicone remover tool
- Isopropyl alcohol or mineral spirits
- Clean rags or paper towels
- New silicone sealant
- Caulking gun (if applicable)
- Masking tape (optional for clean edges)
Step-by-Step Process
- Prepare the Area: Ensure the surface is dry and free from any biofilm.
- Soften the Silicone: Apply a silicone sealant remover according to the product's instructions. Let it sit for the recommended time to soften the old silicone. This step makes removal easier, especially for stubborn or aged sealant.
- Cut and Scrape Off Silicone: Use a utility knife to cut along the edges of the old silicone. Gently scrape away the sealant using a plastic scraper or specialised silicone removal tool to avoid scratching surfaces.
- Clean the Residue: Use a rag soaked in isopropyl alcohol or mineral spirits to clean off any leftover residue. Repeat scraping and cleaning until the surface is smooth and free of silicone.
- Dry the Surface: Allow the surface to dry completely before applying new silicone. Moisture can interfere with adhesion.
Applying New Silicone
- Choose the Right Silicone Sealant: Pick a silicone sealant suitable for the area (e.g., waterproof silicone for bathrooms).
- Prepare the Surface: Ensure the area is clean and dry.
- Apply Masking Tape (Optional): Place tape along both sides of the joint for clean, straight lines.
- Load the Silicone Sealant: Cut the nozzle of the sealant tube at a 45° angle to create an appropriate-sized opening. Load the tube into a caulking gun.
- Apply the Sealant: Evenly apply the sealant along the joint in a continuous motion.
- Smooth the Sealant: Use a silicone smoothing tool or a wet finger to press and smoothen the sealant into the joint.
- Remove Masking Tape: Carefully remove the tape before the silicone starts to cure to prevent pulling up the sealant.
- Allow to Cure: Let the silicone cure according to the manufacturer's instructions (usually 24–48 hours).
Conclusion
Whilst there are many cleaning methods that can remove mould from silicone, it is always recommended to remove and replace the silicone for a long-lasting result. Maintaining a clean, dry environment will also help prevent future mould growth. For more advice, visit our mould prevention tips page.
