New owner
 

I just bought my first Cadillac - a used 2006 SRX. I have noticed, however, that the carpet seems to be stained. The dealer cleaned it but the stain is back. It almost appears as if someone cleaned it with something that stained it. It is a brownish-tan stain and covers the front and back seat floorboard. Could this be floorboard rust and what the heck should I do???