Do a search on wipers, you'll find a thread about removing the black plastic cover and lubricating the mechanism. Also might try cleaning the windshield, and replacing the wiper blade. Mine came from Walmart, 24 inches I think.

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus