As to the sprayer, try cleaning them. On my VW, you also can adjust them by using a small pin, maybe same with BMW? My window broke on me last year. Sounds like the same symptom. When I pulled the panel off, stuff was broken. Hope yours turns out better.
1995 325I, tinted windows, K&N, debaffled air box, BMW style #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 style heated mirrors, various interior bits, Bosal cat-back