condensation
I've seen this also. Don't believe you can prevent it, and it has not caused mildew or mold problems for me. You could put a bag of dessicant in there. They are made for moist basements and really pull a lot of moisture. When wet, you renew them by baking.
I've seen this also. Don't believe you can prevent it, and it has not caused mildew or mold problems for me. You could put a bag of dessicant in there. They are made for moist basements and really pull a lot of moisture. When wet, you renew them by baking.