Hey guys, sorry if i seemed a little rough up above.
As MK2 said, they are normally used on boats, wharves, buildings by the sea and cars in snowy areas/rainy (chemicals such as salt added to the road surface increase corrosion rate).
I dunno how good that system is. It might be total shit as you said, or it might work. Never tested it.
I have a friend that regularly works on boats, and appplied voltage is the bees knee. It works very well.
Once again, sorry.