Larry,
If the haze that you are talking about is from moisture that causes a cloudy appearance from under the surface, there is not a practical solution unless it is just on one or two cabinet doors. If it is extensive or on the cabinet frames, the cost of a proper refinish job for the interior cabinets for a 2000 Marquis will total the coach. Fifteen years ago, I looked at purchasing a used 1998 Marquis from Florida with very cloudy cabinets, but when I was quoted $45,000 by a RV cabinet shop in Bend to refinish the cabinets, I decided to purchase the 2000 Marquis that I have now. However if the haze is on the surface, a furniture polish like "OZ" will remove it.
Gerald