today i just noticed that my left exhaust pipe has a line of brown tarnish from the inside out on the bottom of the inner cylinder. i have magnaflows, and had them for about two months. was wondering if anyone else has this problem. i tried to clean them when i washed my car, but it didn't seem to want to come off. was thinking of getting some brasso type cleaner, or silver cleaner to remove the tarnish. what are your opinions? thank you.