My own opinions about the nature of mildew: It's my experience that once the record and jacket are removed from the cellar they likely came from, and stored thenceforth in a normally climate controlled environment, mildew will not grow anymore or spread to anything else near or touching it. This is why you never see mildew anywhere else in a house other than a damp basement or in between the tiles in the bathroom - if moisture is not present, it will not form or grow, and in fact dies. I have bought records (and other items) that were mildewed and put them into climate controlled storage for quite a while before taking them out and cleaning them, and it has never grown or spread in the meantime, and fact was always better than it was when I first got the item, because it was dead. Chemical agents to "kill" mildew on a record or jacket are overkill, IMHO. Physically removing it is what you need to do. Once it has been wiped, scrubbed, rinsed, whatever you prefer to do, away from the surface and put in a dry environment, it won't be back. Applying a moistened towel to aid in physically cleaning it from the surface, and then drying afterward will not cause it to experience a "growth spurt". The reason folks use bleach in cleaning the bathroom tile isn't to kill the mildew (although it will do that) so it can then be removed - scrubbing will also do that by itself, and besides it will soon grow again in that environment - it's done to literally bleach out the color of the stain it makes when it grows into the grouting and leave it white, which is something I don't want to do to a record jacket. If the bleach solution someone is using on their jackets is so dilute that it doesn't bleach the image, then it's not doing anything about the mildew either - it's the moistened wiping that's doing it. I know there is also a product for cleaning vinyl records that purports to work better than other solvents because it "kills" microscopic fungi supposedly thriving in the grooves of all our records; this is also not the case, IMHO. If this was so, none of my "clean" 40-year old records could possibly exist - they would be overrun with mildew by now, instead of looking about as shiny as the day they were made. OTOH, Albert's suggestions are very interesting to me, not because they might kill mildew, but because they might be valuable ways to dissolve more gunk (including mildew) from jackets without harming the paper or ink.
