I have been using Eva-dry E-500 Renewable Mini Dehumidifier in the closets for years.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The Eva-dry is renewable (no batteries). I plug in once a month and it is restored and ready to go. The silica moisture absorbing beads turn from orange to green to tell you when it’s full! Once full, just recharge in any power strip and watch the indicating silica beads dry up and change colors – it’s that easy! No water or mess to leak or spill.