If mold has penetrated the silicone, trying one cleaning product after another can waste time.

The most reliable approach is:

Remove the old silicone → clean the surface → dry it completely → apply fresh bathroom silicone.

Here’s how to do it step by step.

Step 1: Remove the Old Silicone

Start by cutting along the edges of the old silicone with a sharp utility knife or silicone-removal tool.

Work carefully so you don’t scratch the bathtub, shower tray, tile, or surrounding surfaces.

Once you have loosened the edges, pull away as much of the old sealant as possible.

For stubborn residue, use a dedicated silicone-removal tool or scraper suitable for the surface.

Step 2: Remove the Remaining Residue

After removing the main strip, inspect the joint carefully.

Small pieces of old silicone can remain stuck to the surface. Remove as much as possible before cleaning.

A clean surface is important because new silicone needs good contact with the surrounding material.

Step 3: Clean the Area Thoroughly

Once the old sealant is gone, clean the joint and surrounding surfaces to remove mold, soap residue, dirt, and other buildup.

Use a suitable bathroom mold cleaner or another product specifically labeled for the surface you’re cleaning.

Never mix cleaning products.

In particular, never mix chlorine bleach with ammonia, acids, vinegar, or other cleaning chemicals because dangerous gases can be produced.

Always follow the product’s label instructions and ensure adequate ventilation.

Step 4: Let Everything Dry Completely

This is one of the most important steps.

Do not apply new silicone while the joint is damp.

Dry the area thoroughly with a clean towel and allow it to air-dry completely.

If necessary, leave the shower unused for several hours or overnight.

Moisture trapped behind new silicone can contribute to mold returning.

Step 5: Apply New Bathroom Silicone

Choose a high-quality sanitary or bathroom silicone sealant designed for areas exposed to water and humidity.

Apply a continuous bead along the joint.

Try to maintain consistent pressure on the tube or applicator so the bead remains even.

Step 6: Smooth the Silicone

Before the silicone begins to skin over, smooth the bead using an appropriate silicone-smoothing tool or another method recommended by the product manufacturer.

The goal is to create a continuous, neat seal without gaps or air pockets.

Step 7: Allow It to Cure

Don’t immediately use the shower.

Follow the manufacturer’s curing time. Depending on the product, this may require several hours or longer.

Using the shower too soon can compromise the new seal.

What If You Don’t Want to Replace the Silicone?

See more on the next page