This lever can be found on the Right side of the steering wheel.
Follow these steps to turn it on:
Push the lever up once (slow intervals)
Push the lever up twice (fast intervals)
Push the lever up thrice (very fast intervals)
Follow these steps to turn it off:
Push it back down to its original position
To activate the wiper at the back, push the lever away from you. Remember to switch this off once you are done.
To spray the water jet onto the windscreen, pull the same lever towards you.