Granville Sub Zero Car Windscreen Screen Wash Concentrate -15C Protection 5L

For normal conditions, the recommended dilution is 1 part Granville Sub Zero Screen Wash Concentrate to 4 parts water.

The winter dilution, which is 1 part screenwash to 2 parts water, provides protection down to -15°C.

No, the product is a concentrate and must be diluted with water before use according to the recommended ratios.

For a 5-litre reservoir using the winter dilution (1:2), you would use approximately 1.67 litres of concentrate and 3.33 litres of water.

Store the concentrate in a cool, dry place, away from direct sunlight, and ensure the container is tightly sealed. Avoid storing undiluted concentrate where it can freeze.

Yes, this screen wash concentrate is suitable for use in most vehicle windscreen washer systems. Always refer to your vehicle's manual for specific recommendations.

Ensure the screen wash has been diluted correctly for the ambient temperature. For freezing conditions, use the 'Winter' dilution ratio (1 part screenwash to 2 parts water) for protection down to -15°C. If already frozen, wait for temperatures to rise or use a de-icer product.

The dilution may be too high or too low, or the windscreen may require cleaning. Adjust the dilution ratio. For stubborn dirt, a stronger dilution or pre-cleaning the windscreen may be necessary. Ensure you are using the correct dilution for the current conditions.

Check the washer fluid level. If the fluid is frozen within the system due to insufficient protection, you may need to wait for warmer temperatures or use a de-icer. Check for blockages in the washer jets or pump.