Great work Blah Blah..
How does your little dehumidifier work?
I looked up cheap dehumidifiers, the majority seem to use Calcium Chloride. It is described as a desiccant and would appear to work in anhydrous form much like Silica Gel, to exploit it's hygroscopic nature.
These dehumidifiers seem to employ replaceable tablets (of Calcium Chloride), so it's not clear to me whether the tablets can be regenerated by drying as Silica Gel can.
Since your experiment seems to have been a success, ( and I like the science behind it) I would be looking to get a bigger version of the dehumidifier in there, laying out as much as £3.50 for one with replaceable tablets... The capacity of your brilliant cheapie must be limited to it's size. Although not a big problem if it can be dried out and re-used. Probably no more to buy at 69p than the tablets anyway?
Blue Peter badge for this one..
https://en.wikipedia.org/wiki/Calcium_chloride