That said, the de-icing system actually has been mentioned before as a cause.
Having not read either article, I’m willing to believe a de-icing system could be responsible. I’m not at all buying into the pigeon poop.
Don’t rule it out completely. You know how dragonflies are attracted to cars because they reflect sunlight just like water? Some of the bugs go so far as to lay their eggs on cars, and there’s a theory that when heated sufficiently by the sun, the eggs corrode the clear coat the same way acid rain does. Beware! Nature is sick of automobiles hurting the environment, and it’s striking back!