Screenwash is the liquid used in a car’s windscreen washer system to help clean the glass while driving. It helps remove dust, dirt, insects, oily road film and other deposits that can reduce visibility.
It is easy to overlook until the washer reservoir becomes empty, but keeping it topped up is a simple part of regular car maintenance.
What Is Screenwash?
Screenwash, also called windscreen washer fluid or washer fluid, is a specially formulated cleaning liquid for a vehicle’s washer system.
When you activate the windscreen washers, the fluid is sprayed through small jets onto the glass. The wipers then spread it across the windscreen to help remove dirt and other contamination.
Some vehicles also use washer fluid for the rear window or headlamp cleaning system.
What Does Screenwash Do?
The main purpose of screenwash is to keep your windscreen clear.
It can help remove:
- Dust
- Road grime
- Insects
- Mud
- Oily film
- Light dirt
- Other road deposits
A clean windscreen is particularly important when driving in traffic, during rainfall or when headlights and streetlights create glare at night.
Screenwash vs Plain Water
Water can remove some dirt, but it does not provide the same cleaning performance as a proper washer fluid.
Screenwash contains cleaning agents designed to help break down substances such as grease and road film. Some formulations also contain additives for specific conditions.
If you are using a concentrated product, follow the manufacturer’s instructions for dilution rather than guessing the ratio.
Types of Screenwash
Ready-to-Use Screenwash
This type can normally be poured directly into the washer reservoir.
It is convenient because you do not need to measure or mix it before use.
Concentrated Screenwash
Concentrated screenwash needs to be diluted according to the manufacturer’s instructions.
One bottle can provide multiple fills, depending on the recommended dilution ratio.
Summer Screenwash
Summer formulations are designed primarily for cleaning dirt, dust and insect residue.
This type is more common in markets where freezing temperatures are not a concern.
All-Season Screenwash
All-season formulations are designed to provide cleaning performance across different conditions and may include protection against freezing.
The appropriate product depends on your climate and the manufacturer’s instructions.
How to Add Screenwash to Your Car
Topping up screenwash is usually straightforward.
- Park the car safely and switch off the engine.
- Open the bonnet.
- Locate the washer-fluid reservoir.
- Look for the cap marked with a windscreen spray symbol.
- Open the reservoir.
- Add ready-to-use screenwash or correctly diluted concentrate.
- Close the cap securely.
- Test the washers.
If you cannot identify the correct reservoir, check the vehicle owner’s manual rather than pouring fluid into an unknown container.
Can You Put Screenwash in the Coolant Tank?
No.
The screenwash reservoir and coolant reservoir serve completely different purposes.
Putting screenwash into the coolant system can cause problems and should be avoided. Always identify the correct filler before adding any automotive fluid.
The same applies to engine oil, brake fluid, power steering fluid and other vehicle fluids.
Why Is My Screenwash Not Spraying?
If you activate the washers and nothing comes out, the problem may not simply be an empty reservoir.
Possible causes include:
- Empty washer reservoir
- Blocked washer jets
- Frozen or unsuitable fluid
- Failed washer pump
- Damaged hose
- Electrical problem
- Loose connection
If the pump can be heard but fluid is not reaching the windscreen, the jets or hoses may need inspection.
If there is no pump sound at all, an electrical or pump-related problem may need to be investigated.
Screenwash and Windshield Wipers
Screenwash works together with the windscreen wipers.
The fluid loosens and carries away contamination while the wiper blades sweep it across the glass.
If the wipers are old, cracked or damaged, you may still get streaks even when you have plenty of screenwash.
If your windscreen remains smeared after using the washers, inspect both the glass and the wiper blades.
Choosing Screenwash for Nigerian Driving
For Nigerian drivers, a good screenwash should be suitable for the local conditions and the vehicle.
Dust, traffic pollution, insects and rain can quickly leave deposits on the windscreen, particularly during long journeys.
A quality washer fluid can be useful when driving through busy urban areas or on interstate roads where stopping frequently to clean the windscreen is inconvenient.
Common Screenwash Mistakes
Some drivers only remember the washer reservoir when it becomes completely empty.
Other common mistakes include:
- Using an unsuitable household cleaning product
- Mixing products without checking compatibility
- Incorrectly diluting concentrate
- Ignoring blocked washer jets
- Using the wrong reservoir
- Continuing to use worn wiper blades
- Waiting until a long journey to discover the reservoir is empty
Checking the level regularly takes very little time.
Does Screenwash Clean the Entire Car?
No.
Screenwash is designed primarily for the vehicle’s washer system and windscreen or other compatible washer surfaces.
It should not automatically be treated as a general-purpose car cleaning product. Different surfaces, including paint, plastics, wheels and interior materials, may require products specifically designed for them.
When Should You Top Up Screenwash?
There is no universal mileage interval because usage depends on how frequently you use the washers and how much fluid your vehicle holds.
Check the reservoir regularly, particularly before:
- Long road trips
- Interstate journeys
- Rainy-weather driving
- Driving through dusty areas
- Holiday travel
- Regular highway driving
Some vehicles have a dashboard warning when washer fluid is low.
Screenwash Before a Long Journey
A clean windscreen is important when driving for several hours.
Before setting off, check the washer fluid, wiper blades and windscreen condition. Clean the outside of the glass if there is heavy dirt or residue already present.
It is also sensible to make sure the washer jets are working properly before leaving.
A small maintenance check at home is easier than discovering a visibility problem halfway through a journey.
How Travo.ng Can Help With Your Journey
Vehicle preparation is an important part of planning a road trip, especially when travelling between Nigerian cities.
If your car is being prepared for a journey, Travo.ng can also help with travel bookings, transport coordination, vehicle hire and other logistics when you need alternative travel arrangements.
Screenwash is a small part of vehicle maintenance, but it performs an important job. Keeping the reservoir filled with the correct fluid and making sure the washer system works properly can help you maintain a clearer view of the road.
