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Keep in mind that the factory uses a thick dye to mark where the throttle plate comes in contact with the TB during assembly for calibration purposes. From what it looks like in the pic, it is the factory dye you are looking at and it takes considerable more "elbow grease" to remove that dye than normal blow-by that causes TB contamination. Looking at the picture after cleaning I would say 99% sure you were removing the dye as there is still residue left after cleaning which definitely in not blow-by as blow-by would have easily melted off with brake cleaner and left you a pristine clean surface on such a low mileage car.
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