Try kerosene or bbq startin fluid.
You have to know what the solvent or mix is made of to cut certain products.
vinegar acidic acid will cut spray foam and un set epoxy.
it will also remove rust and take the bluing off of guns.
Off bug repellent will remove sharpie marks.
Use kerosine or bbq starting fluid to remove tar and left over decal glue from your car.
I have never tried to remove grease pencil marks before I is a guess.
Worth
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