I noticed something when airing up my tires yesterday. Check this out:
This picture is of the rear wheel well, on the front side of the passenger tire. The driver's side rear well is the same.
There is a shelf of sorts, that did a great job of catching all the wet sand from the snowy roads we've had the past day or so. If it's collecting sand, it's also collecting salt. They don't salt the roads much in this area, normally just sand, but you guys in areas where they like to put down salt should keep an eye on this. I may look at making some sort of cover to block this area, after coating it in undercoating.