To remove mildew from finished wood furniture, rub the affected area with a cloth dipped in trisodium phosphate solution, rinse with clean water and set the furniture out to dry before refinishing. Replacing the furniture item is an option if the infection is widespread.
Removing mildew from finished furniture requires eight tablespoons of trisodium phosphate in a gallon of water, clean cloths, clear water, gloves and mildew resistant paint. Use gloves to protect the cleaner from getting into direct contact with chemicals. Remove mildew outdoors or in well-ventilated locations.
Scrub infected wood surfaces with a cloth soaked in the trisodium phosphate solution. Trisodium phosphate is available in stores under various trade names. The other clean cloth soaked in clean water is used to rinse before drying out the furniture in a well-heated and ventilated location.
Wipe mildew infected furniture upholstery clean with a cloth dipped in diluted alcohol before drying it thoroughly using an electric heater and a fan. If the infection has grown in to the inner pieces of upholstery, it is best to consult a fumigating and disinfecting service.
To prevent future occurrences of mildew, use mildew-resistant paints, which are available in a variety of colors at paint and hardware stores. However, the paint should not be applied to areas where small children can reach and ingest it.