Nearly all paint marker inks can be dissolved with acetone. White and copper are the only colours that can be removed with isoparaffin, benzine or oily products.
For delicate surfaces in particular we recommend using engine oil or edible oil, for instance. It’s not possible to remove the ink from porous surfaces, as the ink penetrates the material. Test on an inconspicuous area first to see whether the solvent has a damaging effect on the surface.