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@AlexB
I think what you have is dried grease. All the light residues have evaporated leaving you a residue that looks like burnt on grease (you get something similar on the edges of frying pans and in ovens).
Does this sond right to you?
What you need is a solvent which will dissolve the grease, but not mark the paint (however, I would guess that the paint will be faded under the grease marks).
I would first suggest cloth soaked in WD40 and left in contact with the grease mark for a few hours, then remove with a sharpened piece of wood (either a "lolly stick" sharpened to a knife edge or a tooth pick).
If this doesn't work, try a cotton wool pad soaked in acetone (but check to see if it attacks the paint first) or possibly some citrus based degreaser.
The aim is to soften the grease and then scrape it off with something softer than the paint. Finally repolish with something like T-cut to get a nice glossy finish again.