I bought a great recording on vinyl. It has light mildew on the disc. Any ideas how to get it off?
Your ideas are greatly appreciated.
Download it illegally on the internet instead. 
Sorry can’t be of help, but I bet google can.
I have cleaned albums with a sponge and dish soap and water in the past with out damaging them. There is also the discwasher cleaner and brush made commercially that would probably work.
I probably shouldn’t have answered so quickly. It would have been fun to see what kind of responses you got from the younger generation unfamiliar with vinyl.
Just throw it in the dishwasher for an hour or so, should do the trick.
(that was probably a joke [just in case you didn’t know])
I think a weak solution of Clorox and water will attack the mildew without attacking the vinyl.
Isopropyl alcohol?
Lots of running warm (but not hot) water. Soften and loosen the mildew int his way.
They used to make special brushes for cleaning vinyl records. The important thing is to use something very soft, and only move along the direction of the groove. The analogue information is recorded in the wiggles in the walls of the groove, and any application of friction that smooths or distorts the grooves will destroy the sound quality.
When working on the record, either put it flat on a soft towel on a hard surface to wipe it, or hold it carefully under the running water. It is soooo easy to scratch or warp a disc.
Interesting that one of the first responses, jokingly, was “just to down load it”. There’s a fundamental difference here: in the days of vinyl, and album or even a single was a possession to be valued; these days, a song is just a packet of data on a hard disk, reproducible or transferrable at will. It was more fun when buying an album was a big decision, and playing it was a bit of a ritual.
And it still is. I still go to the record shop we have in Spokane that sells stuff usually for scratching, and DJ type of stuff, but I like to go in there and buy old albums From Kansas, Fleetwood Mac, and all sorts of other things.
I still love using vinyls.