but where does it say that the vinyl as used in vinyl record production contains plasticizers?
Agree that the best solution (pun intended) is to use 25-30% IPS and water with a little very water soluble surfactant (detergent) added.
If 'stains' remain stubborn, I have used biothanol (100%) or even pure d-limonene to effect the job. I buy second owned vinyl, sometimes from some very dubious sources, so it is a good ploy to have some safe solvents in the cupboard.
currently listening with:
Lenco 59, Rega 250 + s/s stub and c/w, cAT92e cart in a metal housing, Plattamat2, Michell's clamp,
Musical Fidelity X-LPSv3, Cambridge Audio 640v2 x2
JPW Sonatas x 4, augmented with Fountek CD3 ribbon tweeters and EPOS 10 inch bass units