The best way to switch on the wipers of the Shuttle is to leave it in the setting as shown in the picture. 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.
In order to use the water jet spray in the car, just pull the same lever towards you for a quick jet spray.