I am scanning my fathers slides that got damaged last year in a move. They have been in slide magazines (Airequipt) for years. Moving day, last year, the moving boxes they were in had gotten wet. I did not know until recently, when I opened my guest room closet where I had the movers stack the boxes and was bowled over by the musty smell. I drug all the boxes out to the garage and tore off the cardboard Airequipt boxes that were notably damaged, after photographing the labeling on each end box. I bought archival boxes to store the slides in after I finish scanning them. In the meantime, as I am scanning, I am separating the damaged, no image slides, into zip lock bags and putting all scanned slides into lidded plastic tubs with a bowl of activated charcoal in each, to store until no noticeable smell remains. My question is: if there is any mold in with the scanned slides will it continue to deteriorate the good slides when archived? Typically my house is between 72-77 degrees and humidity ranges between 40-51 percent.
If the slides are mounted in cardboard frames, you'll need to replace the frames, since they will contain mold spores, as well as clean the film with isopropyl alcohol, as @Peter_Taylor mentioned. There is a nice tutorial for the entire process on WikiHow.