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With the black mark, get a Brillo pad, the wire wool impregnated with soap type stuff.
Get it all wet and very very very gently rub the black mark with the wire wool. Make sure it it’s soapy as possible and be as gentle as possible and it will come off without harming the paint. This is what I usually do to get paint transfer and other miscellaneous marks off paintwork.
Tried that but still won't come off...