FAQ: Windscreen wipers service mode
It is known that the drivers side windscreen wiper when in their normal "down" position catch the edge of the bonnet. Forcing it will result in paint damage. To put the wipers into service mode, locate the wiper stalk, and with the ignition on and the car stopped, press up twice very quickly (handbook says within half a second!). The wipers should then operate and stop where they can be lifted or changed.