I'm sure it is the soap at the car wash, however I have never owned a vehicle where outside trim was affected. I've owned Ford, Toyota, Acura, and Mercedes. None of which ever had car wash soap affect any trim. This appears to be a problem with the anodised aluminum not being properly sealed. I was in the anodising business for years and coloring the anodise is always followed by sealing which closes the pours of the anodise structure. This creates a permanent barrier to protect the colored layer below, which is highly corrosion resistant. This issue is my only disappointment with the Telluride. Proper design and testing at Kia in real world environments (car washes) is obviously not being done when it somes to this trim. If it cannot hold up for a year, it shouldnt meet any design input regarding corrosion resistance. Can you spell RECALL Kia?