The Best Cleaner for Fiberglass Boat

The Best Cleaner for Fiberglass Boat

The fiberglass section of a boat faces a constant battle with the elements when it’s out on the water. Over time, this exposure can lead to deterioration, causing your beloved vessel to lose its luster. If you’re nodding in agreement, then you understand the importance of finding the best cleaner for your fiberglass boat.

In my own journey as a boat owner, I’ve learned that selecting the right cleaning product is just as crucial as the cleaning process itself. But with so many options on the market, how can you be certain that you’re choosing the perfect cleaner for your precious boat?

Fear not, because I’ve taken it upon myself to explore and evaluate nine top-notch cleaners that can work wonders in restoring and maintaining the fiberglass portions of your boat. Join me as we dive into these reviews, and soon you’ll discover the ideal solution to keep your boat looking as good as new.

Cleaner for Fiberglass Boat Reviews – My 9 Top Picks

What is the best cleaner for fiberglass boats? Let’s get into the review of these products as I inform you of my experience with them.

1. 303 Products (30306) Aerospace Protectant 

I will start by looking at my personal favorite; the Aerospace Protectant from 303 Products. It is a robust UV blocker that has been handy on my boat as it prevents fading, premature aging, and cracking.

One thing that has made me continue using it is the ability to dry into a bright mate finish. Many people find it hard even to notice the presence of this cleaner, once it gets dry.

My boat used to lose color before I came across this aerospace, and I can confidently say that it is now as a brand new. Besides, you can’t notice any sign of rust, thanks to this product.

Another thing I find to be engaging with this product is the application process. I spray and wipe it.


  • Easy to use
  • Effective and safe
  • Blocks UV light


  • Might need to use a lot of product

2. 303 Products 30674 Marine and Recreation Fabric Guard 

Sometimes I buy this product from 303 to avoid the problem of purchasing many bottles of the #1 product above. I also came to fall in love with this guard as it helps to restore my boat.

And I can tell you that it has come in handy to provide adequate resistance against soiling. Besides, since I used this model, I haven’t noticed any oil-based or water-based stains on my boat.

It is also a superb clear that has maintained the fabric color of my boat. I also like the fact that it is nonflammable and doesn’t affect my breathing when applying it.

And if you have a natural fiber or synthetic one, you can rest assured that it won’t damage it.


  • For natural and synthetic fibers
  • Comes in a large container
  • Removes stains


  • A bit expensive

3. STAR Brite Snap and Zipper Lubricant + Protectant 

If you are worried about your budget, then I can recommend you the STAR Brite Snap and Zipper. I rarely use this product because it comes in a small tube of 1.75 oz, but when I do, I get satisfactory results.

Often, I buy it to apply to my boat snaps, plastic, and metal zippers to protect it against corrosion. Besides, it has helped to reduce wear and friction of my boat and even repel salt deposits.

I love the fact that it is a non-toxic material that cannot affect my health when applying on my boat. It is also non-staining, leaving my boat as new as before.

I also find it to be quite useful since it doesn’t wash off even when I clean my boat with soap or other detergents.


  • Protects from 650 degrees F to -65 degrees F
  • Doesn’t wash off
  • Non-toxic product


  • Comes in a small tube

4. 303 Products 30340CSR Marine UV Protectant Spray 

30340CSR is one of the products that I can recommend you try for your boat’s deck. It comes in a spray bottle that makes it easy to apply – you only need to spray and wipe it dry.

It is more like the first product in this review as it also dries out into a clear matter finish. Besides, it is a model that blocks all UV rays and prevent fading, premature aging, and cracking.

I have used this product a couple of times when my favorite has been out of stock, and I can say I am impressed. What more, I often apply it to rubber, plastic, carbon fiber, vinyl, and Plexiglas.

It also prevents rust and restores the boat color.


  • Restores boat color
  • Prevents rusting
  • For most materials


  • Like the first product (303 Products 30306)

5. STAR Brite EZ-ON EZ-Off Hull and Bottom Cleaner

STAR Brite EZ-ON EZ-OFF Hull and Bottom Cleaner is the product I choose whenever I want to clean my boat’s hull. I find it to be effective in removing deposits on the bottom of my boat.

It doesn’t matter whether it is scum line, rust, or other stains; this product quickly gets them off my boat. Also, I like its ability to loosen hardened deposits that have stuck on the bottom.

And I find it to be environmentally friendly even when on the water as it is made of water-based material. The manufacturer argues that it is made using a buffering process that makes it safer than acid-based cleaners.

Besides, its price is revivals other products on the shelves today despite coming in a huge bottle.


  • Very affordable
  • Made of water-based products
  • Loosen tough messes


  • Can be hard to apply

6. Star Brite Ultimate Aluminum Cleaner and Restorer

My friend had a pontoon boat that had become dull and stained due to the beating it had taken over the years. He found this product and applied it, and I can confidently say that it is a model that restores even canoes and Jon boats.

We applied it, and within minutes the stains and dull on the aluminum part had gone away to leave a shiny look. What I like about this cleaner is that it is recommended as a polish.

Moreover, I find the 64 fl. oz. to be quite hardy since it can last an entire application. I also must mention that it is easy to apply this cleaner and restorer.


  • Cleans and restores newness
  • Comes in a handy bottle
  • Easy to apply


  • Should be used as a polish

7. Star Brite Instant Hull Cleaner

Another product that you should consider getting is the STAR Brite Instant Hull Cleaner. It offers a lot of benefits, and that is why it have appeared on our review of cleaners for fiberglass boats.

One thing I like is the ability to remove yellowing, waterline stains, and grime. I also love this product as it gets rid of rust and leaf stains from painted surfaces quickly.

It is the perfect model to apply before you polish your boat’s hull.


  • Comes from a reputable brand
  • Effective in cleaning
  • Friendly to the user


  • Boat needs polish after applying it

8. Salt-Away SA32M Concentrate Kit

We all love safe products, and I can tell you that this is a 100% non-toxic, biodegradable product. You can use it to get rid of salt from your boat to prevent rusting.

Another thing you should notice is that it can also be used for other things like cars and machines. I cannot find enough words to say how pleased I am with this multi-purpose product.


  • Non-hazardous product
  • Made in the USA
  • For most machines


  • Can be smelly

9. BOATER’S EDGE Mildew Stain Remover

The last product I will look at is the BOATER’S EDGE Mildew Stain Remover. It is a model that I have used to remove mildew and mold without scrubbing.

One thing I find to be surprising is the ease of use as you only need to spray it and the stain disappears. It is made using buffered-bleach tech that is safe for marine use and other outdoor activates.


  • Effective cleaning power
  • For various floors
  • Easy to apply


  • A bit expensive

Tips on Cleaning Your Fiberglass Boat

There is no fixed time of cleaning your fiberglass boat – you can do that as many times as possible. With that said, I would recommend you clean it many times if you often head out to the water.

Frequent cleaning can help to improve the lifespan of the fiberglass section, which means you can get value for your boat.

In terms of actual cleaning, ensure that you use fiberglass cleaners like the one I have reviewed above. Also, note that there are no fixed steps for cleaning your machine.

With that note, one thing you should do before you apply the cleaner is to clean the hull first with water. That can remove dirt that might be hiding around.

From there, read the cleaner’s instructions carefully to prevent accidental damaging. I am confident that you now have a clean and new-looking boat.

Final Verdict 

Ensuring the pristine condition of your fiberglass boat stands as a pivotal aspect of its overall maintenance. Yet, the achievement of those sought-after results remains an elusive endeavor if the selection of the optimal cleaner for your fiberglass vessel is not given the careful consideration it merits. In your quest for the perfect solution, it is paramount to select a product that not only aligns with your specific requirements but also harmonizes seamlessly with the confines of your budgetary constraints.

Wise Reviewer

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