I'm grappling with this same issue at the moment - how best to clean
Edison disc metal parts. We just contracted a metals conservator to study
the problem and make recommendations. She's working on it now.
The topic came up on ARSClist in September 2005. If you do a search in
ARSClist for "metal parts", you'll find the discussion.
If you contact me off-list, I can send some additional comments that I've
Jerry Fabris, Museum Curator
Thomas Edison National Historical Park
National Park Service
United States Department of the Interior
211 Main Street
West Orange, New Jersey 07052
tel: (973) 736-0550, ext. 48
fax: (973) 243-7172