Obee (and the rest of you), where in the US are you situated, and did you drive the XE at all during the winter?
Here in NY, the transit authorities decided to switch from regular rock salt/sand to a "brine and beet juice" solution that some other states had already started using.
The stuff is slimy, leaves a slippery residue on paving stones that makes pedestrians annoyed, and turns out to be EXTRA corrosive on auto underbody and parts. I have a front bumper guard made out of COATED steel, and noticed that in two months the coating had been eaten off and the steel guard was turning orange from rust. The stuff ATE through COATED steel!
It had me so nervous, I researched all over the net, and found that the DMV here, along with some professional auto mechanic advisers recommended flushing the underbody and wheels rigorously after the last salt has been washed of the streets.
I use baking soda mixed with soapy hot water, and a garden pump sprayer to spray the stuff well up inside every pocket you can see under the car---that means wheel wells, calipers, lug nuts, tops of exhaust lines.
If you let your car out any time at all during the winter, find out for sure what ice-melt product your city used. If it's beet juice, get it off your car like a bad virus!