How to Remove Rust Stains from Fiberglass

Fiberglass is used to coat a lot of different surfaces. It is used from boats to tubs and the one thing in common for most of those is that these are usually used in water. So it becomes inevitable that you will have to deal with rust stains. Are you going to require simple household items or more specialized products for the job? You need to find that out, but one thing’s for sure- you need a really light touch when removing rust stains on fiberglass. Read on to learn how you can do it.

Steps to Remove Rust Stains from Fiberglass

To remove rust from fiberglass, you only require simple items and as light a touch as possible. There is no need to use too much force or abrasive materials to do the job, as that would likely damage the fiberglass.


  • Baking soda
  • A piece of cotton cloth
  • Soft nylon brush
  • Sponge


  • Wet the rust stain. Then spread a layer of baking soda on top of it. 
  • Moisten a soft nylon brush and scrub the baking soda on the rust stain. 
  • The baking soda and the water in the brush will combine to form a paste. If it doesn’t form a paste right away, you might need to add more water.
  • Let the baking soda paste rest on the rust stain for at least one hour. Use a clean and wet sponge to rinse the baking soda paste off the fiberglass.Double check to make sure that there is no baking soda paste residue left on the fiberglass surface.
  • If traces of the rust stain remain, use acetone.
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Common Questions About Rust Stains on Fiberglass

Will Vinegar Remove Oxidation from Fiberglass?

Can you use vinegar to remove oxidation from fiberglass? Vinegar is one of the cheapest and most readily available products that you can use for cleaning. The answer to this is yes. You can indeed use vinegar to help remove the oxidation from fiberglass. And its a pretty simple process as well. First of all, you would want to do this because oxidation makes fiberglass boats or any other coated material look older than it is. Using vinegar will help renew the look of the fiberglass. Mix three or four tablespoons of vinegar with one gallon of water. Apply this mixture to the surface of the fiberglass. 

Can You Use Bleach on Fiberglass?

Yes, you can definitely use bleach to clean whatever fiberglass surface you might have at home. For example, you need to clean your fiberglass shower floor using bleach. How do you do it? 

Combine one cup of household bleach and detergent in a bucket full of hot water. You can certainly use bleach for removing tough stains on the fiberglass floor. It is also important that you do not forget to open the windows before you even start the cleaning process. And you also need to put on a respirator mask. This is important because you wouldn’t want to inhale the fumes from the bleach and detergent solution. After you are done with using the bleach solution on the fiberglass floor, use water for rinsing and then let it dry. 

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Can a Magic Eraser be Used on Fiberglass?

This answer is a little bit more complicated than a simple yes or no. While on one hand, Magic Erasers are indeed effective in cleaning fiberglass. In fact, some would argue that it is the best solution for cleaning something like a fiberglass shower. It would not even take more than 10 minutes for you to clean the fiberglass if you use Magic Eraser plus an oven cleaner. But in spite of that effectiveness, there is a problem with using a Magic Eraser. And it’s the fact that Magic Eraser could contain some toxins that could affect your health and that of your family and even your pets. This is not totally proven though, so if you want to take a risk by using Magic Eraser on fiberglass, you could do so.


Fiberglass is a versatile material. It can be used as a material for all kinds of things. One of the most ordinary uses is for boats and other things that often come in contact with water. And you know what comes next of course – rust stains. It’s a good thing that there are plenty of simple solutions to help you remove those unwanted stains quickly and easily. Just follow the simple steps and see the rust stains fade away into obscurity before your very eyes.

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