In article <44fd1o$sr9@netnews.upenn.edu>, gosfield@dolphin.upenn.edu\ says...
>I have a friend with some valuable gelatin silver prints which have
>acquired a few mildew spots. Is anyone experienced with safe methods >of removal or at least stabilization (ie kill them mold spores and >hopefully suppress those nasty yellow brown spots)

Avoid water-based products - the mold has probably rendered the gelatin water-soluble. I find that Kodak film cleaner or some types of undiluted
alcohol work well. Try anything first on a scrap print made on similar
paper, if posible.
Hope this helps.