It's the salt used on our roads to melt ice and snow. If you live in an area where salt is used, you MUST flush your underbody and remove all that "spray" that gets under there after driving on roads treated with salt, even after all the ice and snow has melted. Some car washes have undercarriage treatments that go a long way towards minimizing the effects of road treatments.
You have to consider the many areas that these road treatments could accumulate on your vehicle and be viligant in your attention to these areas, regardless of make of vehicle. You could be an ace at maintaining your vehicles' exterior, but failure to properly maintain the undercarriage will result in this condition. This is one reason I limit my driving when my vehicle might be exposed to salted roads.
I've lost quite a few Cragar wheels due to exposure to road salts and cold conditions that didn't permit me to promptly clean them. And it doesn't take much exposure.
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