by Alain Hoffmann
Window washer liquid
Left - Discovery ,
Right - Defender.
Your car has a LARGE reservoir for this liquid. Sure you can use water.
But you better have some sort of additive in it to dissolve smear and
grit. I successfully use a 50% mix of water and alcohol in winter and
a 20% mix in summer. Don't buy any already mixed stuff- you will pay for
water with a bit of additive.
The reservoir on Discoveries has an built-in filter that can be removed
for cleaning. Always leave it in when topping up.