I use Meguiars Quick detailer spray on my '09. Since the wood on my coach and all other Marquis' (as far as I know) were sprayed with automotive clear coat, I treat it like polishing a car. This stuff is easy and cheap, it cleans the grimy finger prints off, and lasts as good as polish. Oh yea did I say it's easy.
I don't know about any Marquis earlier than '04 but I did the same it too.
Steven