I know of a book called _Preserving Family Keepsakes: Do's and Don'ts_ by Ilene (Chandler) Miller. It's a good reference on the preservation of all kinds of family memorabilia, including photographs. The publisher is: Shumway Family History Services, Yorba Linda, CA, (714) 693-8703. I am sure there are many other sources, probably available at your local library, which might be of help. Also, your local camera shop would be a good place to ask questions. As I recall, most of the cleaning materials the above book suggested were available at a good camera shop. Good luck! ~D. Thompson