Mildew due to storage or cold/ humid conditions can be removed by washing down with Dish soap and warm water. After wiping down and drying. Apply a good polish.
Need to kill the mold. Wash down with vinegar then spray with Lysol mold and mildew killer.
To remove mildew from wood cabinets, paneling, or furniture, vacuum the loose spores with the soft brush attachment. Then, clean small areas using a well-wrung cloth dipped in a few squirts of dishwasher detergent and a gallon of water. Rinse with a clean, water-dampened cloth and dry immediately with a fan. Don't oversaturate the wood, as it could warp and damage the finish. If a cloudy film forms, wipe the area with mineral spirits. Otherwise, apply a thin coat of furniture polish to restore the shine and protect the finish.
Patricia: I spray mine with a bleach-based cleaner... they are in the cleaning products aisle of the grocery store.