This is GREAT for blueing/yellowing exhaust pipes
Link:
http://www.blue-job.com/

Stuff is like magic...
(found in most local "Harley shops") About $10.00
Tip: I have found that after using the product few times, my pipes stay silver longer. The key is letting it sit wet, then buffing when it's dry. like U would a car wax.
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It takes some work, but this will take off melted shoe marks, melted plastic & get our dis-colored stainless headers looking good.
*Your exhaust WILL look silver (chrome) when done & the "blueing" will not re-appear. However, over time they will ALWAYS turn sort of off-gold because they are stainless & have been heated once.

Other Option: Take to a professional local metal pollishing place did mine once. (about$60.00)
Note: they will still turn gold after pollishing. esp. if they over heat in the process!
Once again...Blue job will remove the gold in this case as well.
I use this before showing my bike.

Member,
G@ry J@mes
AIS SUCK!