This is an age old problem with books as well as other things that have mold. First two warnings, do not use this if there is any nickle plating on the case and work with this in a well ventilated area.
Use a flat bottom small dish and put equal parts Clorox bleach and white vinegar about a tablespoon of each. This makes a low grade chlorine gas and will kill everything. I've used this for over thirty years on paper goods such as books which I place in a large plastic box with a good top, I fan out the pages and after a day replace the liquid and reposition the pages.
