We live Colorado and have owned our Enclave since Oct. We noticed that all the chrome on the vehicle has deteriorated. The dealership said it's from MgCl (used to keep the roads from icing). They said they'll replace it but only once. We get the car cleaned regularly and haven't seen this problem with our other vehicles. Anyone else having issues? I'm not comfortable signing off that GM will only take responsibility this one time, it seems like defective chrome to me. Thoughts?