This lever can be found on the Left side of the steering wheel.
The level have 3 levels of wipers speed, push down 1 level for low speed, level 2 is mid speed and level 3 will be speed.
There a turning switch that allow you to toggle ON/OFF the rear wipers. There are low speed and high speed.
To use the water jet spray on the car's windscreen, pull the same lever towards you for a quick jet spray.