So i live in New England. This time of year the roads are very salty. Yet i can't go without driving the SDL for more then a week or so. I do my best to clean her off every trip out but it sucks then the hose is frozen, and the dirt road i live in makes it hard to go to a car wash and come home with her clean.

I want to just use some ind of rust prevention type paint on her. My plan is to just cover as much as i can of the undercarriage, do the insides of all the wheel wells, and use POR 15 when doing so. A guy who used to own 1950's Benz back 20 or so years ago told me he used to just spray the under with kerosene. He also said he used to make his own under coating.

Now from what i have heard POR 15 is the best to use. But how do i go about cleaning off my car's underside? I read on the POR 15 web site they say to use this marine clean stuff, but i know that unless they mix magic in that stuff its not going to get all the grime off my car. Someone also told me to go under with a wire brush and clean everything down to metal, but it says POR 15 sticks best to rusty surfaces. I'm lost here as to what do?

If anyone has done a DIY rust prevention job please your feedback would be great.