I have the answer to your problem Mike, these mites live in the lubricants of your camera ,they can't survive sub-zero temperatures the way we used to zap them was to take the lens off the body, remove the film and battery , wrap the body in cling film, put it in a freezer bag, and leave it in your freezer overnight.
The following morning allow it to come to room temperature, replace the battery film and lens. I know this sounds weird but in my experience it works