If mildew is left to grow, it will continue to grow and stain textiles, books, walls, tile and other surfaces in your home. Mildew is a mold with spores. Those spores will not grow and spread except under certain conditions. Mildew thrives on organic materials like paper, leather, and natural fibers such as wool, cotton, and linen. Mildew requires moisture, darkness and warmth to grow.
Prevention is the best medicine.
Keeping surfaces clean, well ventilated and dry will help keep mildew from growing. In closed areas, use a dehumidifier or desiccants. These are materials such as silica gel or alumina that absorb moisture. If you have air conditioning, it will reduce the temperature and humidity to levels that prevent mildew growth. Keep fabrics and surfaces clean and dry.