Opel ASTRA Owner's Manual page 17

Windscreen washer
Pull lever.
Windscreen washer system 3 77,
Washer fluid 3 200, Wiper blade
replacement 3 203.
Rear window wiper
Turn outer cap to activate the rear
window wiper:
ON : continuous operation
INT : intermittent operation
OFF : off
In brief
Rear window washer
Push lever.
Washer fluid is sprayed on the rear
window and the wiper wipes a few
times.
Rear window wiper/washer 3 79.
15