Am I the only one that changes his washer fluid twice a year? I do mine in fall and spring. On my '97 Maxima, it involves removing a lower splash shield to get to my reservoir, and a couple bolts on it. On my wife's '88 Nissan pickup, it is as simple as removing 3 easily accesible bolts. Now that I think about it, siphoning may be easier....
In Louisiana, a summer fluid is really great for our bugs. In winter, we do get temps in the 20's, so freeze protection is nice. Plus, the winter ones help remove the light frost from the windshield.
Thirdeye, I recently bought a gallon of the RainX All Season 2 in 1 orange fluid. I haven't changed fluids in either vehicle yet, though (I'm running behind, but it isn't excessively cold here yet). The RainX All Season supposedly protects to 0*F, and can remove bugs, too. May be adequate for southern use, but northerners would need better freeze protection (I'm origianlly from Ohio, so I can understand what happens up north). The RainX also applies water beading technology. It contains methyl alcohol.
Dwendt44, I think you may be referring to Prestone's "De-Icer Windshield Washer Additive". I have a bottle of that, too. It contains methyl alcohol, ethylene glycol, and isopropanol. Supposedly boosts freeze protection by atleast 20*F (not necessarily to -20*F). May be extremely worthwhile to people up north, even added to winter fluid. It helps repel road spray, removes light frost and ice, and reduces refreeze. I have it just for the added peace of mind, and for if I decide to visit family in Ohio during winter.
Dave