woodsyi,
I think Todd the Vinyl Junkie has a product called Vinylzyme....natural enzymes that remove bacteria (ie, that cause mildew).
While my records were in storage in my garage, I had a flood one winter 4 years ago. 1/2 of my (then) collection were destroyed (the covers, actually, as water doesn't destroy the underlying record). I used the Vinylzyme on most of the collection and they came out smelling like the proverbial rose

I haven't bought the Vinylzyme since as very few records are still mildewed....but when I run into one, I use my normal cleaning agent from LAT International called Kleer-disc and it works very, very (perhaps equally) well. It, too, advertised itself as having enzymes that eat away bacteria. It's also a very effective everyday cleaning agent for your RCM, too

I, too, replaced all the liners with poly liners from Tim at TurntableBasics. Many covers were destroyed, however (I've replaced a few that I could find in the $0.50 bins since, however)
John