There are various cleaning methods out there.
The more "professional" data recovery methods usually involve cutting up disk jackets, but obviously we don't want to do that to collectible factory-original disks.
I'd advise against applying alcohol to a spinning disk. As I've sadly observed, this can increase the friction between the jacket and the "cookie" surface, and cause an ugly mess. I would only suggest that as a last resort if a disk has been cleaned with other methods first, and a specific track is giving errors with no dirt/residue visible on the disk.
Although not terribly professional, I've adopted a method of washing with tap water that, for me, works well with 5.25" and 8" disks. (It is difficult to dry 3.5" disks). Basically run warm (hot enough you can comfortably touch it - and no soap!) water down through the hub while propping the jacket around the hub open, and a bit around the head opening. If done carefully, I can avoid getting the label wet. Top left, top right, bottom left, bottom right. That rinses off the entire disk surface and the jacket interior as well. The trick then is drying, which I do by gently propping up the jacket with q-tips around the hub (too much pressure can dent the cookie), and trying to avoid touching the magnetic part of the cookie. Then I put in in front of a fan, or I also happen to have an air purifier that blows air in them nicely. I've also found it is a good idea to re-locate the q-tips after an hour or because the jacket can on rare occasions with low quality disks (WABASH!) sort of stick to the cookie. Don't throw them in a drive until the cookie manually spins freely and you see no moisture on the surface. I have had no problems with any kind of mineral residue - or at least infinitely less than than that of the dirt/sand/residue/debris/coffee/etc that so often hides inside a disk jacket.
After all of that, I'd following up with a simple manual visual inspection of the disk surface and touch up any remaining spots with a q-tip and alcohol.
Of course if anyone has a better idea I'm all ears.
