New windscreen
Well. It worked for me!
My wipers were horrible too. Partly due to age I think (been on there for at least 35k km) , but also partly because I had the remains of Rain-X on my windscreen. Rain-X is fine in the beginning, but wears off very fast IMO, leaving you with a windscreen that does not seem to dry but stays covered with tiny droplets instead. With local spots the reacts different... horrible.
Try and get the Rain-X off (when you think it wears off).
Maybe get the angle of your wiper adjusted too.
My windscreen had taken the hit of stone last summer and I got it replaced almost 2 months ago. Plus a new wiper. Wow, never seen a wiper work that well! And it still does, 6000km further down the road (with lots of rain and dirt on the road).
So just wait until you catch a stone too and have it replaced by the insurance company....(you do not have to take that serious, you know...)
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(2003 Silver 1.4 Tdi Exclusive(SE), 95bhp/235Nm chiptuned by ABT, black interior, sport seats, heated mirrors, TomTom3 PDA Satnav, JVC KD-SH909RB cd-receiver, Infinity Kappa 63.1 + Vifa on-dash tweeters, 12" Subwoofer on 300w Amp)