Like Glen, I have my scopes and gear in a dedicated cupboard sort of thing, with a little dehumidifier running 24x7.
{Pretty sure I got the idea from a previous post by Glen on this subject. Thanks Glen

)
Being close to the coast, the humidity is always high, and those refillable moisture absorbers
https://www.bunnings.com.au/damprid-...orber_p4470041
were just not cutting it.
This
http://www.ebay.com.au/itm/500ml-Min...item43ed3eccdb
seems to do the job.
And as a side bonus, I get an unlimited supply of distilled water.