I purchased my used 08 H3 a few months ago. I have noticed that there is a spot on the passenger headrest that appears to be stained. The stain has an appearance like white dust, but does not remove from the seat as dust would by patting it with my hand or wiping it. Any suggestions on what this might be and how to remove it without creating more stains, such as water stains? Not sure if anyone else has had an issue with their black interior looking "dusty" or stained?