I would use some lighter fluid (Naptha) which you can purchase at any local drug store. Engine must be cold. Wipe the pipes down with the lighter fluid to clean off grease, oil, and gas residue. Lighter fluid will evaporate upon contact and will not harm the finish. If you want a nice patina on the pipes, you can wipe them with a light coating of WD40. You will notice a bit of smoke upon start up but it will burn off and leave a nice golden brown amber color on the header pipes. Good luck with it.
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