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It's science experiement time!
It MIGHT be tar. Try a hair dryer - or heat gun, but be careful. If it softens, take off as much as possible with a wooden or plastic scraper so as not to gouge the metal.
Some things soften with oil. Use a few drops of machine oil on one small area, wait 30 min. and see what happens.
WD-40. It works on so much, try a spot - again give it time to work - then try to wipe it off.
Aircraft Stripper - designed to take off clear coat. This stuff is wicked bad, but will strip a lot of stuff.
Well there is a starting list.
Good luck, Paula
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Today is a gift. That's why they call it "the present"
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