Oh Mark, believe me, I got lucky with this one. I have buddies in Ohio that never see anything 8 years or older that doesn’t have rust somewhere. My little daily Scion has rust starting, and it’s 9 years old. I have to take an extra antidepressant when I see the salt truck circling before a snow.
You mentioned slag. I an an engineer at a manufacturing plant. Years ago, I used to park as far away from it as I could because of the iron dust. It wasn’t as bad as slag fallout, but I had to polish my pickup every month to save the paint. Thank goodness we run a much cleaner shop now. But I concur, metal fallout and salted roads have killed a many nice vehicles!!