Who Else Has a Collection of 78 RPM Records?

I was just given a collection of 78's. I ordered an Ortofon 2M 78. Got a good price on it.
I have not played a 78 RPM record since I was a child. Anybody have any recommendation about cleaning. There is a mildew smell to the covers. My guess is it is very bad to use anything with alcohol in it to clean them as alcohol will melt shellac. I plan on cleaning all of them and giving them proper inner sleeves. Many of them are stored in collection books, not the original covers which were usually just paper. 

I would appreciate any advice on care and management!