Finally got to drive mine ("lowly" 04 limited) for the first time in over a week after travelling and returning to a nice pile of snow outside, and I can certainly testify to the power of the permagrin!

I worry about the mag chloride here in CO, but I've managed to wash pretty well (including undercarriage) every single weekend I've owned the car so far save one, so I figure it'll probably be okay. I didn't buy the car to let it sit, after all!