no real reason to worry about it. It is not a "dirty" part. You would not crack open your exhaust system to clean them out. I would only clean it if you had it out or replacing it for some other reason.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)