I use Wurth washer fluid concentrate religiously. I swear by the stuff, it is fantastic. Hard to find, but add an 8 ounce bottle to a tank of regular blue washer fluid.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record