You might get other responses to the contrary, but i have used bleach (weak bleach solution) to clean moldy records when I have purchased some that had been kept in a moist area. The weak bleach solution ( one ounce in a quart of water) will remove the mold. It will not hurt the vinyl. Swimming pools that use vinyl liners are routinely treated with bleach solutions during cleaning. I use the bleach solution as a part of a cleaning regiment when i have moldy records than i have purchased. I start with routine cleaning with soap solution, then use the weak bleach, the followup with a steaming then rinse.
Can a small amount of bleach hurt your records?
I have been using L'Art du Son record cleaner and noticed that a whitish gray bacteria or some kind of growth has developed in my container. I was told that a few drops of bleach might control the problem but could it damage a record?