doc-phil wrote
You know those packs of crystal things that come in shoe boxes that say 'Do not eat'? They almost look like lil salt packets? U coulda maybe chuck some of those in your case to soak up some moisture. That would at best be a temporary solution but its the only thing that I could think of! ?
As Alan says above....the stuff is called silica gel....available at pharmacies. It absorbs water vapour.