When I was changing the display cabinets in my private museum I noticed some mildew on my No. 2 Eureka Junior camera. I took a soft cloth, moistened it with a bit of alcohol and wiped of the mildew. This works very well on black leather. But the Eureka Jr is covered with some kind of leatherette and this material got sticky when it was moist with alcohol. I concluded that the alcohol could dissolve the leatherette and I stopped immediately. Not much harm was done, but I won't use alcohol on that camera again!
The Todd Gustavson book arrived and the first impression is very positive. Lots of color photos of wonderful old cameras and no full pages of text. (Is that the bad influence of the internet?)