Windscreen Wash Cleaning

SEP d.o.o. from Mokronog, Slovenia, specializes in the development and production of components for complete windscreen wash cleaning systems for the automotive industry. With around 30 years of experience in automotive washing technology, the company provides solutions ranging from the first product idea and development phase to serial production and final assembly. SEP combines blow moulding, injection moulding, thermal plastic welding, overmoulding and other advanced manufacturing technologies.

The company’s core expertise lies in manufacturing the components required for the complete function of windscreen and headlamp cleaning systems. Its product range includes washer fluid tanks, front and rear window nozzles, hose assemblies, connectors, grommets, pumps, sensors and other parts required for fluid distribution throughout the vehicle. SEP can supply complete systems or individual components, depending on the customer’s technical requirements.

Production is carried out in Slovenia and Bosnia and Herzegovina. The Slovenian site in Mokronog combines headquarters, research and development, sales and manufacturing, while the production site in Bijeljina supports selected manufacturing operations. This structure enables SEP to combine technical development with flexible and cost-efficient production for international automotive customers.

Complete windscreen washer systems for the automotive industry

A modern windscreen wash cleaning system must reliably store, transport and distribute washer fluid in a wide range of operating conditions. SEP therefore develops complete solutions that may include a blow-moulded washer tank, different pumps and sensors, piping across the vehicle and nozzles for the front or rear windows.

The company has been involved in the production of automotive washing systems since the 1990s. Its history in this field began with the production of washer tanks, followed by spray nozzles and later complete fluid distribution systems. Over time, SEP developed into a supplier capable of participating in projects from the early development stages of a vehicle.

A dedicated assembly department carries out testing and helps ensure the required cleanliness and functionality of tanks, nozzles and assembled components. SEP also emphasizes flexibility: when a customer does not require a complete system, the company can manufacture only the selected components needed for a specific vehicle platform.

Large-scale production helps optimize manufacturing costs, while precise and technologically advanced processes support consistent quality and short production times. SEP also states that it works to maintain short delivery times and adapt production to customer needs.

Windscreen wash cleaning components for global automotive brands

SEP operates as a development supplier for the automotive industry and exports approximately 90% of its production. Its components are used in vehicles from brands including Renault, Nissan, Ford, Peugeot, Volvo, Jaguar, Fiat, Volkswagen, Škoda, Citroën, Toyota, MINI, BMW, Land Rover, Mercedes and GM.

The company has grown from a small manufacturer into an international automotive supplier and is involved in the development of products from the early design stages. Its manufacturing capabilities cover both complete washer systems and individual plastic components, while quality requirements are supported by automotive-industry standards and certified processes. A 2025 certificate lists SEP’s scope as the design, production and sale of windscreen cleaning and headlamp cleaning systems, plastic air intake systems and plastic containers.

If you are looking for a reliable partner for windscreen wash cleaning systems, washer tanks, nozzles, hose assemblies or other automotive washing components, contact SEP d.o.o. in Mokronog, Slovenia. The company can support projects from development and prototyping to industrialization and large-scale serial production.