A humid bathroom can invite serious mold and mildew growth. Don't despair; fight back with a few simple tips! First, clean surfaces with mold-killing cleaners like vinegar or hydrogen peroxide. Then, remove old, cracked, and moldy caulk with a utility knife or caulk remover and replace it with a clean bead of waterproof silicone. If possible, also increase ventilation to the room by adding an exhaust fan or running a dehumidifier.