I live in a pretty damp area (PNW), and have more trouble staying on top of mold/mildew than anything else. I've found a mold killer that comes in a pump spray bottle that works very well. I've been doing some experimentation with it on old leather and wood, and so far it's been great. I'd be happy to share the name of the stuff if I could only find out what the CO (OC) has done with it.
I would like to know more about your experiments and the name of the product if it works out for you. I have several rifles that just insist on fuzzing out, mostly Indian 2A1s. Other nearby rifles have no dramas, but I 'd hate to see it spread!