This lever can be found on the Left side of the steering wheel.
Follow these steps to turn it on:
Turn the small knob up once (slow intervals)
Turn the small knob up twice (fast intervals)
Turn the small knob up thrice (very fast intervals)
Follow these steps to turn it off:
Turn the small knob down to its original position
To spray the water jet onto the windscreen, press the button on the left side of the lever.