Mold and mildew are fungi that develop in areas that are damp and in areas of low airflow. They spread through spores and are difficult to eliminate. Cleaning and conditioning are the best ways to remove mold and mildew from a baseball glove. After you clean the glove, store it properly to prevent mold and mildew from returning.
Clean off the mold. The University of Missouri Extension Service recommends a mixture of 1 cup rubbing alcohol and 1 cup water to remove mold and mildew. Dip a clean cloth into the diluted alcohol, squeeze the excess moisture from the cloth and wipe the entire glove, not just the areas where you see mold.
Dry the glove in front of a current of air. Set the glove in front of a fan or over an air register. You can dry the glove outside if the sun is out and it is breezy, but if it is overcast or the air is calm, dry the glove inside.
Wash with sudsy water if mold remains. Stubborn cases of mold and mildew may require a second treatment. Use a mild dishwashing solution to mix up some sudsy water and repeat the process, cleaning the entire glove, not just the areas where mold is present.
Use a leather conditioner made specifically for baseball gloves after it is completely dry. Start at the palm area and work the conditioner out toward the fingers, rubbing it in gently with your fingers.