So I've had my wonderful GT for four months, when either 1) someone deliberately poured some type of chemical on my hood in an act of cowardly, malicious vandalism, or (admittedly more likely) 2) something dripped onto my hood when I was briefly parked in a run-down, urban parking garage the other day. I'm pretty sure it's the second scenario, as a repeat visit to the garage and examination of the ceiling certainly suggested evidence of all kinds of leaking who-knows-what from every crack, crevice and light fixture. (Yes, I'm kicking myself for not noticing this when I parked, but I was in a hurry at the time ...) As the pics below indicate, I'm now left with a bizarre streak of discoloration that seems to be oxidizing by the day. An immediate, gentle washing within hours after the incident was of no help, and rubbing the affected area with one's finger produces a whitish haze and a dirty residue on the fingertips. Would welcome any thoughts and suggestions for my anticipated remedial measures, especially from those who have experienced such misfortune in the past. Thanks.