I am curious about this as well. Have a 3M clear bra on the front end of my car, with some scratch marks, not able to feel/gauge the depth. Anyway...
No not dirty that I can see, but to be honest my eyes are not that of a professional. I was just amazed when I bought the car (not a week ago)...
I have sliver novillo leather in a '08 M3. I just got this car and the leather is in fantastic shape. As a once every-couple-day routine, is it...
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