How to clean burned material of the exhaust headers?

Have a tar spot, other methods lightened, not gone.
Found a penny walking. 1983. Darn.
 
Many know this probably, took me awhile,, but discovered today, clean mufflers when warm! sooo much easier to get tar specs off.
 
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Take a clean old cotton towel right when the muffler is still hot - and everything can be wiped of as if it was Chocolate... had this with parts of a black plastic bag on my Scrambler. Went off in a second...
 
I've always used the cold Easy Off oven cleaner with never a problem. Spray on and leave alone for 24 hours. Then wipe off.
Will not harm the finish!
I will try next time. Worked my arse off last time rubbing with never dull. Time before came off easy with warm pipes. Not this time! Not all tar created equal! Did not have penny before 1953, or was it 43.Thanks for posting.
 
I turned the engine on after couple minute later seen smoke coming of the headers, once the engine was turned off there was burned material all over the exhaust header!!! its hard and dark.... How do I clean it?

Thank you.
Fine grit sand paper