Easy. Switch the ignition on and then off. Lift up the wiper switch till it won't lift any more. Let go. Wait until the wipers sweep across the screen twice. They will come to rest in a vertical position. Carefully lift each blade back off the screen and clean.
328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect. JB4 on Map 2 with Catless DP produces awesome performance in Sport.