I jumped the gun a bit too fast. We just bought this ML last month and my wife is not quite familiar with the car. She did not turn off the wiper properly. She pushed the lever it to the lowest position thinking that was the 'off' position. After I went back home and took a look and noticed it was not turned off. The 'off' postion is in the middle. After I pushed it back up one notch it turned off. Thanks very much.