Opel ASTRA 2017 Owner's Manual page 17

Windscreen washer
Pull lever.
Windscreen washer system 3 92,
Washer fluid 3 232, Wiper blade
replacement 3 234.
Rear window wiper
Turn outer cap to activate the rear
window wiper:
OFF : off
INT : intermittent operation
ON : continuous operation
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 94.
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