Vacuum the furniture with an attachment hose to remove surface debris and dirt.
Mix a solution of warm water and a few drops of dish soap in a bucket. Dip a soft cloth into the soapy water, and wring it out well.
Wipe down the furniture with the cloth and soapy water, and rinse out the cloth frequently while cleaning. Scrub hard-to-reach spots and crevices with a soft toothbrush and the soapy water.
Rinse the furniture with a clean cloth and plain water. Dry it with a soft cloth, or set it outside in the sun to air-dry.
Fill a bucket with 1 gallon of warm water and 2 tablespoon of ammonia.
Scrub the furniture, paying special attention to the mildew spots, with a rag moistened with the ammonia solution. Use a toothbrush to scrub in crevices and cracks that are difficult to reach with the rag.
Rinse the furniture well with clean water. Dry it with a soft cloth, or let it air-dry.