One way to remove fingerprints from comic books is to use a mild cleaner specifically designed for delicate surfaces. Spray a small amount on a cloth and then gently rub the affected area. Make sure to test it on a small, inconspicuous part first to ensure it doesn't cause any damage.
First, try wiping the mildew off with a dry cloth. After that, you might consider using a mild fungicide spray, but make sure it's safe for the comic books. Let them air out thoroughly to prevent further mold growth.
To remove wrinkles from comic books, you could lay them between two smooth boards and stack something heavy on top. Make sure the boards are clean and won't leave marks. Or, you might consider using a special comic book restoration spray, but it's important to follow the instructions carefully.
To remove water stains from comic books, you might consider using a hair dryer on the lowest heat setting and hold it at a safe distance to dry the moisture. Also, you could sprinkle some talcum powder on the stains and gently brush it off after a while. Just make sure to handle the comic book with care throughout the process.
You can try placing some baking soda packets inside the comic book storage container. Baking soda absorbs odors and can help get rid of the musty smell.