I bought these small dehumidifiers on Amazon. I've used two in my car, but there are eight left to give away. I didn't think they worked very well, but they may be better inside.
The amazon link is here: https://www.amazon.co.uk/gp/product/B015AOGP1S/ref=ppx_yo_dt_b_search_asin_...
Small dehumidifiers (Ealing W5)
Collection Times
Any time.
Any time.
This offer has been gifted to someone and is no longer available.