How to Remove Silicone Caulk from Fiberglass Shower Stall

How to Remove Silicone Caulk from Fiberglass Shower Stall

Shower stalls are a hot-bed for mildew growth. They encourage fungi colonies because of their high moisture content, something that renders the bathroom unsightly. Removing the mildew, however, is an uphill task. Many homeowners, therefore, replace the silicone caulk on their fiberglass shower stalls since it: 

  • Is a cost-friendly solution to mildew growth
  • Eliminates fungal nests from the shower closet for good
  • Fast to administer
  • Does not require a lot of expertise

Tools Needed

Below are the items you need to complete the exercise. 

  • A best pressure washer surface cleaner 
  • A sharp knife 
  • Silicone caulk remover
  • A vacuum cleaner
  • Bleaching agent
  • Silicone-based caulk
  • Alcohol

But there is more on How To Remove Silicone Caulk From Fiberglass Shower Stall. You need to do the magic by:

Removing Soap Scum Using a Surface Cleaner

Soap scum is the solid white or gray layer formed when bathing soap combines with the calcium and magnesium elements in hard water. The scaly build up then affects bathroom aesthetics by encouraging mildew growth. Destroying the colony, therefore, should be your first order of business. You must, with the help of a surface cleaner eliminate the scum to make silicone caulk removal easy. 

Pulling the Old Caulk Out

The silicone-based caulk is soft to the touch. It is also easy to detach using a sharp knife or a silicone caulk remover. Combining the two, however, makes the process effortless. 

Scrubbing Exposed Surfaces Using Alcohol

Scrapping the caulk off the fiberglass is not enough. You must also scrub the exposed areas with lots of alcohol. Doing so eliminates small caulk fragments you might have overlooked.


Why is a vacuum cleaner important? Vacuuming helps you eliminate old silicone caulk from inaccessible areas. It also leaves you with a clean area; a zone you can apply new silicone caulk on. 

Adding the Bleaching Agent

Excess bleach might damage the metallic parts on your fiberglass shower stall. You must, thus, dilute the bleaching agent with enough water to prevent corrosion. 10% bleach to 90% water ratio gets recommended. 

Next, you need to spray the solution you made onto your working area and let it rest for about five minutes. The solution destroys mildew and mold colonies fast. Last, you must scrub the area with clean water to eliminate the bleaching agent. 

Choosing the Right Product to Use

There are so many products you can use on your fiberglass shower stall, but only the silicone caulk fits the bill. Recall, silicone is soft and dries up fast. Second, it is easy to remove when there is mildew build-up, making the process inexpensive too. 

Applying the Silicone-Based Caulk 

You do not have to be a genius for you to apply the product right. Remember, using a small tipped insertion gives you the desired outcomes. The insertion helps you apply the right amount of material, thus preventing wastage. 

But there is a catch. You must squeeze only 0.6 centimeters of the product onto the vertical and horizontal joints. Moreover, you need to press your fingers against the paste and even out the rough edges. Eliminating the excess paste keeps the area neat and clean. 

Performing a Re-Run

Caulk application is a one time job. Therefore, you must get things right the first time. But how do you achieve the level of perfection you desire?

Performing re-runs helps. It allows you to identify flaws fast, edges that need more caulk application. You can then apply some extra paste onto the identified zones to create a balanced outlook. 

Giving the Worked Up Area Enough Time to Dry

It is best if you apply new silicone caulk on the cleaned-up area fast. Recall, the water used for cleaning keeps the zone damp and thus perfect for caulk installation, and here is why. The dampness helps the product stick to the joints like glue. 

Besides, it ensures that the silicone caulk penetrates deep into joints and crevices. You must, anyhow, give the worked up area enough time to dry after caulk application. A twenty-four-hour window is the most recommended. 

Cleaning the Shower Pod before Use

Last, you need to clean the shower stall before use. Disinfecting the area with clean water and liquid soap safeguards your health. It also makes the fiberglass shower stall accommodating. 


A fiberglass shower pod brings heaven on earth. It allows you to enjoy a hot shower in a glass enclosure, making your bathing space one of a kind. But such a location is a hot-bed for mildew growth. 

It becomes unsightly when mold colonies thrive, with the only solution to your predicament being silicone caulk removal. The article above is, however, an excellent guide on how you can remove old silicone caulk and replace it with fresh paste to make you bathing space friendlier. 

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