How much isopropanol is effective but safe for viny?

I found this, from an article written by a chemist:

"Unfortunately, there are many misconceptions related to plasticizers – for example, about phthalates “leaching out” and “easily dispersing/gassing out” from PVC products. This is actually unlikely to happen unless very abrasive detergents or solvents are used or if the items are exposed to extreme conditions for an exceptionally long time. Plasticizers do not readily migrate or leach into the environment from items because they are physically bound within the PVC matrix. If they could readily migrate, flexible PVC would not remain flexible and perform as intended."

Feel better now?  (Phthalates are one kind of commonly used plasticizer.) The key words are "physically bound within the PVC matrix".

As I indicated, my information came from The Dick Doctor who has spent his life in research and development of products specifically related to cleaning records. I would prefer to err on the side of caution rather than risk damage to my collection. Your collection is NOT my concern if you choose to gradually destroy it because of your own arrogance in the face of facts.

Yep, I am sure you do consult the Dick Doctor. 
I've already asked, what are your "facts"?  State your case.  My own "arrogance" is based on trying to find the truth, only.  If I were to find well conducted science that proves your point, I would be more than happy to accept it.  What I have found so far casts doubt on the notion that diluted isopropyl alcohol, used once or twice per LP, could do any possible harm.  I am open to your logical counter-argument, but not your BS.  Have you accepted the fact that cartridges are inherently balanced devices, yet?

@lewm Stop feeding the troll. You can leave a vinyl record submerged in 100% alcohol for 10 years and it will be like new after removed.

12oz distilled water
2oz of 91%+ isopropyl alcohol
Few drops of Woolite.