Oh guys, trust me, I way back when I would have laughed at this stuff, maybe it's just Chicago that has more salt on the roads than snow, I can't speak for any other areas; just the rust battles that I have delt with in the past.
My pop's 99 F-150 is made love to and his brake lines have rotted away, gas tank about fell out of the truck, and all seams look just plain vomitous. The front corner cab mount looks like something off a 1960's truck and I've already had to replace an exhaust manifold from it rotting through.
Maybe it was just a bad run of rust coatings on the F-150's, but I am talking regular undercarriage washing, claybar and waxing and doing the best I could to prevent salt damage but it looks like I haven't done a thing to this truck as far as preventative maintenence cleanings. I had to do front calipers at 38,000 because the slider pins froze up on it from salt.
I also bought a Nissan Spec V and cleaned it religously in a heated garage. After 5 years I was under there with a rattle can because stuff looked like shiot.
Just the salt in the air was/is corroding all the aluminum under the hood; it's like WTF. Maybe it's the waking up in the dead of winter to a wet car from the humidity that does it, it's like Georgia dew point with IL cold.
I have never used this stuff personally, so I will give it a try.
Salt-Away Applications ...
I certainly am not advertising this just saying this is what I will try, because I've done the fresh water undercarriage washes once a week and I've still lost terribly in northern IL.
I've done the research and there are always others who say to use vinegar, sulfameric Acid at a less than 5% solution, baking soda, copious water, grab some phospherous for an ounce of prevention.
I think using these products are like motorcycle rides, you have to ride your own ride no matter who says what. Some guys could pee pee on their cars after each snow storm and 30 years later she's rust free, others could use all the top of the line products and have it rust away in 20 years; or maybe not.
I know I have tried to play by the weekly washings with McGuiers and Mothers car wash soaps and for whatever reason, it just hasn't worked for me on my Fords in IL.