OK, I know this is going to sound stupid, but here goes. I have a a 1999 Z3 coupe 2.8l and I cannot for the life of me figure this out: When I turn on the rear windsheild wiper- I cannot turn it off. If I hit the wiper switch forward twice to activate it will wipe twice and then stay off. But, if I have it running I can't just shut it off. I must be missing something.There isn't an 'off' positon on the wiper selector. I have just been hitting it twice when I need it. But I can't just let it run because then the only to stop it (that i know of) is to shut the car off. The manual doesn't say anything. Most of you guys would never admit to such a thing- but it pisses me off that I don't know.