When water-soluble products don't do it, try a paper towel folded into a 3" square pad, dampened with Ronsonal lighter fluid. It's naptha, same thing as used in dry-cleaning.
That will remove non-water-soluble grunge. Then if the laquer skin on the jacket is still dull, you can freshen it up somewhat with a small cloth pad moistened with Armoral, buff to a sheen.
That will remove non-water-soluble grunge. Then if the laquer skin on the jacket is still dull, you can freshen it up somewhat with a small cloth pad moistened with Armoral, buff to a sheen.