Hmmm, that's interesting. I'm not sure what standard washer fluid uses to lower the freezing point. I assumed it was glycol or similar. I've never seen a flammability warning on the blue stuff, though. Maybe it's just that the rainx stuff has so much more of it in order to act as a solvent.

As far as fogging the window, you're absolutely correct. That's one reason I hate rain-x, but in a Florida downpour, MB wipers just ain't fast enough to do the job by themselves.

Meticulously cleaning the window with Windex helps to reduce the fog ups, but they are annoying. Less annoying than not being able to see the road in a downpour, however.

But that stuff disappeared SO fast. I filled the tank with it, maybe washed my windows one or twice tops, and in two days my low washer fluid light was on. I opened the tank and it was only half full. I can't come up with any other explanation than evaporation. That's reason enough to skip this stuff.

Is regular washer fluid flammable? I've never seen such a warning.