Well, here's the ingredient list for Dunhilll NR from the British American Tobacco website as of 8/1/2011:
4.3% sugar, 0.37% plum juice concentrate (kind of explains the raisiny aroma), 0.23% licorice extract, 0.16% "flavouring,"
Well, naphtha definitely will dissolve the wax, no doubt, which is one of it's most common uses in furniture and guitar restoration -- to remove build ups of waxy polishes. But it doesn't dissolve most wood finishes.
Actually naphtha is probably the most common cleaning solvent used for real trouble spots on vintage lacquer finished guitars, and I've used it as such plenty. You just use a tiny dab of it on a cloth, it's not like you drown the surface in naphtha.