Anyone have mold issues?

living in NC we have a lot of humidity as well. We do develop mold in the TT and there is no leak in the TT. We crack the vents and stay on top of cleaning it with bleach products. if it sits for over. month in the summer it gets a pretty good hit of mold. The mold has even been seen on some of my pans. we haven't tried damp rid because friends of ours used damp rid with no success. Being in a storage lot, a dehumidifier is not an option for us. A routine (every couple of weeks) wipe down of the interior helps. Also we keeps the fridge and freezer doors open in storage to help prevent mold forming in there.