How to Clean A Badly Stained Fiberglass Shower in 3 Easy Steps

A fiberglass shower adds a touch of elegance to any bathroom, but over time, it can become stained and dull due to soap scum, hard water deposits, mold, and mildew.

However, it’s not to clean a badly stained fiberglass shower, as it requires the right tools, techniques, and a little patience.

In this comprehensive guide, we will walk you through step-by-step instructions to achieve a sparkling clean and fresh-looking fiberglass shower.

How do you clean a badly stained fiberglass shower

How To clean a badly stained fiberglass shower? A Stepwise Guide

Before diving into the cleaning process, it’s important to gather the necessary cleaning supplies and ensure proper ventilation in your bathroom. Here’s what you’ll need:

  1. White vinegar
  2. Baking soda
  3. Dish soap
  4. Soft-bristle brush
  5. Sponge or soft cloth
  6. Microfiber towel
  7. Spray bottle
  8. Rubber gloves

Surface Preparation

Surface Preparation

Removing Surface Dirt and Debris

Before tackling the stains, start by dry brushing the fiberglass shower with a soft-bristle brush. This will help remove any loose dirt, hair, or other debris. Be sure to reach all the corners and crevices.

Exfoliating with Baking Soda Paste

Create a paste using baking soda and water in a small bowl. Apply the paste to the stained areas and allow it to sit for at least 15 minutes. This helps loosen grime and prepares the surface for deeper cleaning. Gently scrub the fiberglass with a sponge or soft cloth in circular motions.

Dealing with Tough Stains

Hard Water Stains

Hard water stains are a common issue in fiberglass showers, but they can be effectively removed with the help of vinegar.

  1. Create a vinegar and water solution in a spray bottle, using equal parts of each.
  2. Spray the solution onto the stained areas and let it sit for 15-30 minutes.
  3. Gently scrub the stains with a soft-bristle brush or sponge.
  4. Rinse the shower thoroughly with water to remove all traces of vinegar.

Soap Scum Buildup

Soap scum can build up over time, leaving a stubborn film on the fiberglass surface. Fortunately, there are effective homemade solutions to tackle this problem.

  1. Mix equal parts vinegar and dish soap in a bowl.
  2. Dip a sponge or cloth into the mixture and scrub the soap scum-covered areas.
  3. Rinse the shower thoroughly with water.

Mold and Mildew

Mold and mildew thrive in damp environments, making the bathroom an ideal breeding ground. To eliminate mold and mildew from your fiberglass shower, follow these steps:

  1. Create a paste by mixing equal parts baking soda and vinegar.
  2. Apply the paste to the moldy areas, focusing on the grout lines and corners.
  3. Let the paste sit for 15-30 minutes to allow it to penetrate and kill the mold.
  4. Use a soft-bristle brush to scrub away the mold and rinse the shower thoroughly.

Rust Stains

Rust stains can be particularly challenging to remove, but there are effective ways to tackle them without harming your fiberglass shower.

  1. Create a paste by mixing lemon juice and borax to form a thick consistency.
  2. Apply the paste directly to the rust stains and let it sit for 30 minutes.
  3. Gently scrub the stains using a soft-bristle brush.
  4. Rinse the shower thoroughly with water.

Finishing and Maintenance

After carrying out the cleaning process, it’s crucial to follow these final steps to achieve a sparkling clean fiberglass shower:

Finishing and Maintenance
Finishing and Maintenance
  1. Rinsing Off the Cleaning Agents: Thoroughly rinse the shower with water to remove any cleaning agents or residue. This step is important for maintaining the integrity of the fiberglass and preventing any potential damage.
  2. Drying the Fiberglass Shower: Dry the shower with a microfiber towel or let it air dry. This will help prevent water spots and maintain the cleanliness of the shower.

Tips for Preventing Future Stains and Maintenance

  • Wipe down the shower after each use to prevent soap scum from building up.
  • Use a squeegee or towel to dry the shower walls after each use to minimize water spots and hard water stains.
  • Regularly clean the shower to prevent stains from becoming deeply ingrained.

Frequently Asked Question (FAQs)

What is the best homemade cleaner for fiberglass showers?

A mixture of vinegar and dish soap is a highly effective homemade cleaner for fiberglass showers. It helps remove soap scum and leaves the surface sparkling clean.

How can I clean a fiberglass tub that has yellowed?

To clean a fiberglass tub that has yellowed, create a paste by mixing baking soda and hydrogen peroxide. Apply the paste to the yellowed areas, let it sit for 30 minutes, and then scrub gently before rinsing thoroughly.

How do I clean a textured fiberglass shower floor?

Cleaning a textured fiberglass shower floor requires extra attention. Use a soft-bristle brush or an old toothbrush to gently scrub the textured surface. Rinse thoroughly to remove any leftover residue.

How can I restore shine to a fiberglass shower?

To restore shine to a fiberglass shower, buff the surface with a microfiber cloth after cleaning. Additionally, you can apply a fiberglass cleaner and polish according to the manufacturer’s instructions.

What can I use to remove brown stains on a fiberglass tub?

Brown stains on a fiberglass tub are commonly caused by iron in the water. Mix equal parts vinegar and cream of tartar to form a paste. Apply the paste to the stains, let it sit for an hour, and then scrub gently before rinsing thoroughly.


With the proper cleaning supplies, techniques, and a little elbow grease, you can easily restore your badly stained fiberglass shower to its former glory.

Regular cleaning and maintenance will help prevent stubborn stains and keep your shower looking fresh and inviting.

Follow this comprehensive guide whenever you encounter tough stains to achieve a beautifully clean and sparkling fiberglass shower.

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