So since winter is right next door, I was going to stock up on wiper fluid. I've usually stuck with the orange rainx or prestone deicer during the winter, but they both leave "stains" on the hood.. I'm guessing that this is from the alcohol in the fluid.. Is the percentage of alcohol mixed into it high enough that its bad for paint/rubber parts around the windsheld molding? I'm debating weather to stick with whats been working, or go to the elcheapo stuff since it might actually be better, assuming cheaper means less alcoh... Thanks for your opinions..