The history of Rain-X begins with Howard Ohlhausen’s development of an “invisible” glass coating at Unelko in 1971, which led to the trademark registration and commercial launch of Rain-X in 1972.2

At its core, Rain-X functions as a surface-treatment and automotive visibility brand. The underlying technology renders glass hydrophobic, causing water to form beads rather than spreading into a continuous film across the windshield. This physical property allows airflow and wipers to clear water more effectively, thereby improving visibility.

The company markets the original treatment as creating a slick, water-repellent barrier on exterior glass that repels rain, sleet, and snow. This water-beading principle remains the foundation of the brand and is applied across multiple product lines beyond the original glass treatment.

Development and launch

The technology originated in 1971 when Howard Ohlhausen developed and patented an invisible coating for glass and nonporous surfaces through the Unelko Company in Chicago. Designed to make surfaces resistant to water, soil, and stains, this innovation provided a technological foundation for treating glass without leaving a visible residue.3

In 1972, Howard Ohlhausen and his sons trademarked Rain-X. Positioned as a rain repellent and glass treatment intended to improve driving visibility in bad weather, this marked the official birth of the brand. The original proposition focused on making rain behave differently on the windshield, a concept that remained central to Rain-X for decades.

Expansion and motorsports

In 1981, the Ohlhausen family moved the business from Chicago to Scottsdale, Arizona. During this period, Rain-X expanded beyond its original glass treatment to include Anti-Fog, Glass Scrub, Windshield Wash with Rain Repellent, and other glass-care products.

Beginning in 1985, Rain-X became involved in motorsports sponsorship, forming associations with drivers such as Scott Sharp and Mario Andretti, as well as the Newman/Haas racing team. Motorsports served as a strategic platform because the brand promise of visibility and performance under difficult conditions aligned naturally with automotive racing.

Change of ownership

A significant transition occurred in 1997 when Unelko sold Rain-X to Quaker State, moving the brand from a family-developed specialty product into a larger consumer automotive portfolio. In 1998, Quaker State merged with Pennzoil to create Pennzoil-Quaker State, further integrating Rain-X into a major automotive products organization.

Shell announced its intention to acquire Pennzoil-Quaker State in 2001 and completed the acquisition in 2002, bringing Rain-X under Shell’s broader consumer automotive business.

Diversification into wipers and car care

In 2001, Rain-X launched its first windshield wiper blade, the Rain-X Weatherbeater. This development allowed the brand to evolve from a chemical treatment provider to a supplier of products that actively maintain windshield visibility. Subsequent innovations included increasingly sophisticated wiper technologies.

Throughout the 2000s, the portfolio expanded substantially to include glass cleaners, water repellents, washer fluids, anti-fog products, plastic treatments, and vehicle appearance items. By this stage, Rain-X had evolved into a comprehensive automotive visibility and surface-care brand.

Acquisition by ITW

In March 2011, Illinois Tool Works Inc. (ITW) acquired SOPUS Products’ car-care business, which included Rain-X alongside brands such as Black Magic and Gumout.4 Rain-X now operates as part of ITW Global Brands, a division wholly owned by ITW. The ownership lineage is Unelko, Quaker State, Pennzoil-Quaker State, Shell/SOPUS, and finally ITW.

Since 2015, Rain-X has continued to diversify its technology. Notable developments include water-repellency wiper blades in 2015, silicone wiper blades in 2018, and ceramic and graphene-related appearance technologies throughout the 2010s. The brand celebrated its 50th anniversary in 2022.

Rain-X’s modern portfolio spans several categories centered on automotive visibility and surface care.

Glass water repellents

The Rain-X Original Glass Water Repellent remains the core category. It is designed to create a slick, non-stick barrier on exterior automotive glass that repels rain, sleet, and snow. This product line is most strongly associated with the Rain-X name.

Windshield wiper blades

Rain-X is a major player in the aftermarket wiper blade segment. Current offerings include conventional-style blades, beam blades, silicone blades, water-repellent blades, and premium wiper systems. Product families include Latitude, Quantum Elite, Repellency, and Silicone AdvantEdge.5 Certain models integrate the original water-repellency technology directly into the wiper element, transferring a coating onto the windshield during use.6

Windshield washer fluid

The brand offers all-season washer fluid, bug-remover fluid, de-icer fluid, extreme-temperature formulas, 2-in-1 products, and additives. Distinctively, certain Rain-X washer fluids are formulated to apply water-beading technology while cleaning the windshield.

Glass cleaners

Products in this category include Automotive Glass Cleaner, 2-in-1 Glass Cleaner + Rain Repellent, Pro Cerami-X Glass Cleaner and Water Repellent, Glass Repair Kit, and Anti-Fog products.7 These position Rain-X as a complete automotive glass-care system.

Anti-fog products

Designed to reduce interior glass fogging caused by condensation, this range includes Interior Glass Anti-Fog and Anti-Fog Trigger products.

Headlight and plastic care

Extending its surface-treatment philosophy to other transparent materials, Rain-X offers Plastic Water Repellent, Headlight Restoration Kits, and X-treme Clean. The Plastic Water Repellent is formulated for polycarbonate and acrylic surfaces, including motorcycle windscreens and goggles.

General vehicle appearance

Depending on the market, the portfolio also encompasses car cleaning, bug and tar removal, leather care, interior detailing, and protective treatments.

Rain-X occupies a distinct niche between motor oil, tire, detailing, and car-wash brands. Its primary territory is automotive visibility, glass care, and weather protection. Products address challenges posed by rain, snow, sleet, frost, fog, road grime, bugs, dirt, and windshield deterioration. The brand’s professional division describes Rain-X as a leader in wiper blades and water-repelling technologies.8

The brand maintains a coherent product ecosystem where glass treatments, wiper blades, washer fluids, cleaners, and anti-fog products work toward the single goal of maintaining windshield clarity. Historically, motorsports sponsorship beginning in 1985 reinforced the association between windshield visibility and driving performance and safety.

Rain-X is sold internationally as part of ITW’s global brand portfolio. ITW’s Asia-Pacific materials describe Rain-X as an automotive and household glass-care brand with expansion into categories such as car washing, wax, tar removal, headlight restoration, and glass care. However, exact product ranges, names, and formulations vary considerably between countries. A Rain-X product available in one market is not necessarily identical to one carrying similar branding elsewhere.

The current corporate structure places Rain-X under ITW Global Brands, a division of Illinois Tool Works Inc. (ITW). As a subsidiary of a diversified industrial manufacturer, Rain-X operates as a consumer automotive aftermarket brand within a much larger corporate entity.

• 1971: Unelko and Howard Ohlhausen develop the underlying glass-coating technology.
• 1972: Rain-X trademarked and commercially introduced.
• 1981: Unelko moves to Scottsdale, Arizona.
• 1985: Rain-X begins notable motorsports sponsorship activities.
• 1997: Rain-X sold to Quaker State.
• 1998: Quaker State merges with Pennzoil.
• 2001: First Rain-X wiper blade, Weatherbeater, introduced.
• 2002: Shell completes acquisition of Pennzoil-Quaker State.
• 2011: ITW acquires the SOPUS car-care business containing Rain-X.4
• 2015: Water-repellency wiper technology introduced.
• 2018: Silicone wiper technology introduced.
• 2022: Rain-X celebrates its 50th anniversary.

1. Our History – Rain
2. Terms of Use – Rain
3. Discover Rain-X
4. Our History – Rain-X®Professional
5. Rainx – ITW Global Brands
6. Chemistry:Rain-X – HandWiki
7. Canadian Trademarks Details: RAIN-X — 1150485 — Canadian Trademarks Database – Intellectual property and copyright…
8. Canadian Trademarks Details: RAIN-X — 0685733 — Canadian Trademarks Database – Intellectual property and copyright…