nope never heard on long life washer fluid before. 
but for the dang GM dex-cool, get rid of it. you shouldn't need to flush the system, just make sure you drain out all your old antifreeze b4 you put in new stuff(prestone is what i used).
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2001½ F150 XLT Crew Cab- true dual glasspacks with x-pipe, AEM intake, SCT X3 with VMP custom tunes, full stereo system, HID 55w heads and 35w fogs, 35% tint front and 20% rear, Lightning tail lights
04 F6 Sno Pro Team edition- MBRP race can, ODS clutch kit
01 YZ125- bored out to 144, PnP cylinder and head, Pro Circuit WORKS suspension, many other mods
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