Carefully remove the record and sleeve from its cover. Use a dry cloth to remove any moisture that may appear on the record or sleeve.
Spray an odor-neutralizing product inside of the cover and let the cover dry over night. Make sure the spray is an aerosol product, not a liquid spray.
Locate all additional areas of moisture on the record cover and lightly dab a dry sponge over them.
Rub a paper towel gently across the cover to remove any dirt or mildew before you dry the cover.
Place the record cover outdoors in a sunny spot to let it dry. You can also dry the cover by putting in your microwave for 20 seconds to quickly extract the moisture.