Keeping boat cover plastic windows clear: cleaning, protecting, and avoiding mistakes
The plastic windows of your boat cover deserve proper care. Exposure to sun, salt, and friction means the material needs to be cleaned and protected on a regular basis. With the right product and the right approach, you can keep the windows clear and in good condition. Use the wrong product, and you risk causing unintentional damage.
Why is it important to treat the plastic windows of a boat cover properly?
The plastic window panels used in boat covers are vulnerable to UV radiation, salt water, dust, and friction from folding the cover. All of these factors degrade the surface over time. Regular cleaning and protection help keep the material in good condition and maintain clear visibility through the windows.
Because plastic behaves differently from fabric, it requires its own approach. What works on the cover itself will not work on the windows — and may even cause damage.
How do I clean and protect the plastic windows of my boat cover?
Use the Clear Plastic Cleaner & Protector for this purpose. This product has been developed specifically for plastic windows in boat covers and similar applications. It cleans the surface while simultaneously applying a protective layer that helps guard the material against new dirt and scratches.
Here is how to use it:
- Spray the product directly onto the plastic window.
- Spread it using a soft, clean cloth in circular motions.
- Do not rub too hard — gentle and even pressure gives the best result.
- Allow it to absorb, then buff dry with a separate clean cloth.
For heavy soiling, it may be necessary to repeat this process a few times. In many cases, a single application is enough to see a clear difference.
Can I use a glass cleaner on the plastic windows of my boat cover?
We advise against it. Standard glass cleaners are formulated for glass, not plastic. They can attack the surface or cause fine scratches. The same applies to paper towels or rough cloths — these leave micro-scratches that can damage the window.
Always use a product designed for plastic, such as the Clear Plastic Cleaner & Protector, and work with a soft microfibre cloth.
Will water repellent spray turn the windows of my boat cover hazy?
Yes, it can. Fabric water repellents such as the Sprayhood & Tent Protector are intended for textiles: polyester, acrylic, or canvas. If you spray such a product onto a plastic window, it can leave a white haze or stain that is difficult to remove.
This is a common mistake when waterproofing a boat cover. Cover the windows before treating the cover fabric, or wipe away any overspray immediately with a damp cloth before it soaks in.
Which product do I use for the windows and which for the cover?
Always keep these two separate:
- The fabric of the boat cover: clean with the Sprayhood & Tent Shampoo, remove stubborn stains with the Fabric Power Cleaner, and then protect with the Sprayhood & Tent Protector.
- The plastic windows: use the Clear Plastic Cleaner & Protector only. Never use a fabric cleaner or fabric protector on the windows.
How often should I treat the plastic windows?
This depends on how intensively the boat is used and how much exposure the windows receive. In most cases, one treatment at the start of the sailing season and a repeat treatment mid-season is sufficient. If you notice that water is no longer beading off properly or that the surface looks dirtier than usual, it is time for a new treatment.
Frequently asked questions about plastic windows on boat covers
Can I clean the plastic windows with washing-up liquid?
It is best not to. Washing-up liquid removes surface dirt but leaves no protection behind and can gradually degrade the plastic. Use a product specifically formulated for plastic.
Should I rinse the windows before applying the product?
First remove any loose dirt and sand with clean water. This prevents you from rubbing grit across the surface and causing scratches. You can then apply the Clear Plastic Cleaner & Protector.
Does this product also work on caravan or motorhome windows?
The Clear Plastic Cleaner & Protector is also suitable for plastic windows in other applications, such as caravans. The method of application is the same.