It's not uncommon to see the rear window of a convertible top look cloudy, hazy or even worse, yellow. Sometimes it gets so bad, that the window eventually becomes brittle and breaks.

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For many years now, plastic windows have been made from a 40 mil PVC plastic because they are affordable and effective. However, they are prone to aging and browning and if neglected, can become a safety hazard. The plasticizers in the plastic leach out over time allowing the plastic to become brittle and hard over time. A plastic window that's allowed to do this will become hazy and eventually become opaque making it impossible to see through.

Fortunately, it's not as hard as you might think to keep the window clear and in great shape. We'll show you two ways to keep those windows crystal clear.

Solution 1 will show you how to deep clean your convertible window if it has lost some of its clarity due to the accumulation of hard water spots, mineral build-up and road grime.

Solution 2 will show you how to remove fine scratches and haze from the window restoring them to a like-new condition.

Just remember while both of these solutions are very effective, they do not perform miracles. If your window is yellow, cracking or severely cloudy, you might have no other choice other than to replace it.

 

Solution 1 : Deep Cleaning

Weeks, months or years of sun, hard water, road grime, air pollution, ocean air salt, sap and other environmental pollution can take a toll on your convertible window. The plastic material makes the window light which benefits your car's overall weight balance but the plastic lacks durability to deal with everyday driving. It's important to maintain with regular cleaning to keep it in optimum condition and maintain clarity. If you've neglected it for a while, follow this deep cleaning treatment to restore clarity.

 

What You'll Need:


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50/50 shot showing before and after

 

convertible-window-after.jpg

After cleaning

Step 1

Window should be clean prior to treating. Remove any dust and debris with a damp cotton terry towel.

Step 2

Working in the shade and making sure the window is cool to the touch, spray Plastic Deep Cleaner on to the surface and allow to penetrate for a few minutes then agitate with a 100% cotton terry towel. Rinse the towel in clean water as needed to remove dirt. Repeat until window becomes clear.

Step 3

Finish by cleaning the surface with nextzett Windscreen Clear and a microfiber towel. Microfiber towels are softer than a cotton terry towel when deep cleaning isn't required. It's also lint-free. Microfiber towels last for hundreds of washes and are a must-have in your cleaning accessory arsenal.

You are now complete!



Solution 2 : Haze and Scratch Removal

If the window is cloudy due to scratches and oxidation (haze), you'll need to polish the surface. This can be done using No. 2 One Step Polish. You might ask why we would suggest using a paint surface polish on your convertible window. It's simple. Your car's paint finish is essentially plastic. The abrasives in One Step Polish "see" your convertible window and paint finish as the same type of surface. The abrasives in the polish are just the right size and density to effectively polish the haze from your convertible window. Here's how to do it.


Products Used in This Guide

  • Plastic Deep Cleaner – Heavy-duty cleaner that restores clarity to cloudy or grimy convertible windows
  • Windscreen Clear – Streak-free glass cleaner for a crystal-clear finish after deep cleaning
  • No. 2 One Step Polish – Removes haze and fine scratches from plastic windows to restore like-new clarity
Four einszett metallic paint polish containers in yellow, green, red, and blue, labeled with the same red-and-black shield einszett logo, arranged on a white cloth next to a red surface.

einszett Legacy

Built on a Legacy. Made for What Comes Next.

Since 1936, einszett has set the standard in automotive care. Our Legacy formulas carry forward the quality, performance and results enthusiasts remember.

Shop the Legacy Collection

A Legacy Dating Back to 1936

1936

Founded in Germany

einszett was established by Werner Sauer, Sr. in Cologne, Germany, beginning a legacy of premium automotive care products that would span generations.
A vintage black convertible car parked outdoors in front of a cityscape with a large cathedral spire in the background, shown in black-and-white.
einszett (1Z in German) taken from the license plate issued to cars in Koln, Germany, birthplace of einszett.
1960s

Innovation in Car Care

Pioneered advanced formulations for automotive detailing, setting new standards in the industry.
Vintage-style einszett advertisement showing a woman in a blue shirt holding a large green bottle labeled '1z Autopolitur' and a yellow badge reading '1z Autopflege' on a cream background with abstract shapes.
Historical einszett car-care products from the brand’s early years.
2000

The North American Chapter Begins

einszett North America became the brand’s first export operation outside Europe and introduced einszett to the English-speaking market. The North American website, product labels and catalogs established the brand’s first English-language identity, helping open the door to interest and distribution in additional markets around the world.
The original einszett North America office and team.
2006

70th Anniversary

Celebrated seven decades of innovation, quality, and dedication to automotive care excellence.
A vintage-style infographic timeline showing einszett branding and years from 1945 to 1970, including einszett products, with illustrated containers and a yellow measurement scale.
einszett product evolution, 1945–1970.
Two men standing behind a counter in a retail store. The man on the left wears a white polo shirt, and the man on the right wears a dark suit jacket, light blue shirt, and dark tie.
At Newport Beach Porsche in 2001, one of einszett’s first North American dealer relationships helped launch the brand’s presence in the U.S. market.

einszett Comes to North America

In 2000, einszett entered the North American market for the first time, beginning with a small number of specialty dealers who recognized the quality and potential of the brand.

Among the earliest was Newport Beach Porsche, which became einszett’s first dealer in 2001. From those first placements, English-language product labels, catalogs, and marketing materials helped introduce einszett to a new audience of enthusiasts and professionals in the United States and beyond.

A retail display counter at Newport Beach Porsche (2001) filled with small merchandise, with several black and red shirts hanging on the wall behind, a person standing in the background, and fluorescent ceiling lights overhead.
Three Einszett wax containers on a store shelf at Newport Beach Porsche (2001) Express Polish in gray, Metallic Polish in red, and Glanz Wax in blue, with a white Einszett sign beside them.

The Products That Defined an Era

From groundbreaking formulations to iconic packaging, these products shaped the automotive detailing industry and set new standards for excellence.

A white plastic bottle of 1z einszett Gummi Pflege Stift rubber care stick with a purple label and a detached white cap placed beside it on a white background.
einszett Gummi Pflege

Gummi Pflege Stift

One of einszett’s most recognizable products in North America. Gummi Pflege became a favorite for conditioning rubber weather seals, helping reduce sticking, squeaks, and freezing in cold weather.

A bottle of 1z einszett Brand Cockpit Premium car windshield washer fluid on a plain white background.
einszett Cockpit Premium

Cockpit Premium

One of the products that changed expectations for interior care. Cockpit Premium was among the first interior detail sprays to leave a factory-matte finish instead of the glossy look common at the time, setting a standard that many later products would follow.

A 500ml metal can of  1z einszett Hartglanz Glanz Wax with a blue and white label and a red cap, shown next to its blue plastic lid on a white background.
einszett Glanz Wax

Glanz Wax

At a time when carnauba waxes dominated the market and synthetic protection was still relatively uncommon, Glanz Wax offered a pure synthetic polymer alternative. It stood alongside early enthusiast favorites such as Klasse and Zaino as part of the shift toward longer-lasting synthetic paint protection.

A 200ml bottle of 1z einszett Kristall Klar Washer Fluid concentrate, featuring a green and white label with a red and white logo, on a plain white background.
einszett Kristall Klar Washer Fluid

Kristall Klar Washer Fluid

Kristall Klar helped lead the move toward highly concentrated windshield washer additives long before concentrated tablets and similar formats became common. A small bottle treated a large volume of washer fluid while delivering strong cleaning and low-streak performance.

Part of the Enthusiast Community

From Porsche events and club gatherings to dealer shows and trackside sponsorships, einszett became part of the enthusiast community it served.

Two women posing in front of a white and black einszett race car with red and white decals, number 65, under a white event tent.

Track Days

Pushing limits on the circuit

Car Shows

Showcasing perfection in every detail. First car show (2001)

Car Club Events

Supporting car enthusiasts

A man in a black einszett work shirt stands behind a black Porsche car in a workshop, with other people and shelves visible in the background. A red 'einszett German vehicle parts' sign is on the wall behind him.

Detailing Sessions

Crafting automotive excellence

A red Volkswagen Golf parked outdoors under a red, white, and blue striped canopy, with its trunk open. A market or fair booth with tables, einszett bottles, and a banner reading 'einszett' is set up beside it.

Car Culture

Where passion meets precision

A white pop-up canopy tent set up outdoors in front of a white building, with a red and white banner hanging behind it. Two men stand under the tent at a table with bottles and other items on display.

Dealer Events

Autogeek Detail Fest 2011


The Next Chapter

Today, einszett enters its next chapter—bringing back the classics that earned their reputation through German engineering, now developed and manufactured for the North American market.

The einszett Legacy line carries that tradition forward for a new generation.

Quality. Performance. Results.

The einszett Legacy Collection

A 3.4 fl oz foam applicator bottle of einszett 1z Gummi Pflege Stift rubber care stick, featuring a white and navy blue label with a red and white '14' logo, on a clean white background.
The Return of an Original

einszett Gummi Pflege

Honoring the trusted formula customers have relied on for years, einszett Legacy Gummi Pflege combines proven quality and performance with an improved applicator for easier, cleaner application.

$15
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