The single telescoping wiper on the windshield of my E320 is fascinating to watch and totally unique, but not so fascinating when driving in the rain---despite doing what MB says and spraying the windshield, nothing improved. Despite the rain, visibility was best with the wiper OFF. Is there ANYTHING to do to improve on this? (Better blades, windshield spray-on stuff, etc? The streaking is really bad!

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro