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I've heard a REAL 100% copper penny, Easy-Off Oven Cleaner, "0000" steel wool and WD-40, aluminum foil and WD-40 or Coke Cola......... YouTube may have even more tho.
I'd start with a plastic razor blade or light switch cover, the plastic is soft and won't scratch the steel, gently scrape as much off as you can. After that I go to GOOP hand cleaner, again not a harsh chemical but very effective at softening things without being destructive. I use this approach at the shop to bring old, vintage used parts back to life without causing damage life harsher chemicals can, Rubbing alcohol is another safer solvent. I stay away from using something that you have to rub as an abrasive on the surface. Worst case scenario, replace the chrome heat shield.
Take bike for a good ride, so it is good and hot.
Then as soon as she is parked, pull oil dipstick and use the hot oil and a soft rag.
Had wife's melted boot on my shovelhead pipes for months and discovered this when I accidentally dropped oil on hot pipe.
Get it hot and hit it with spray can oven cleaner, the non-abrasive type. Gets heavy baked-on grease etc off, but not sure about hoodie sleeves. That's a new one on me.
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