Audi A4 Owners Manual
Plain water on its own is not sufficient for the windscreen washer system.
Engine compartment: Windscreen washer container
The container for the windscreen washer
contains the cleaning fluid for the
Plain water on its own is not enough to clean the glass properly. It is therefore advisable to add a suitable washer fluid additive (with wax solvent) to the water. A washer fluid with freeze-resistant additive should be used in winter.
Х Never put in radiator anti-freeze or other additives.
Х Never use washer fluid which contains paint thinners or solvents as it can damage the paintwork.