I am finding some strange deposits on my exhaust tips. It is kind of crusty and light brown in color. It flakes off relatively easily. It's not rust. Any ideas what would cause this. I don't really have any other noticable symptoms; no odors in the exhaust, etc. It forms on the bottom of the tips and at a seam/gap on the side (they are the rectangular z28 tips). I have cleaned it off before, but it comes back in a few days.
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