How much isopropanol is effective but safe for viny?

What’s in the grooves?

Could be anything. My hunch is mostly sleeve dust and household dust. Older records from the 50’s and 60’s could have higher amounts of nicotine and cooking oils. 

Early Beatles records could have pizza sauce or Bonamo Turkish Taffy....;)

I have some records that refuse to quiet down, even after having them ultrasonically cleaned. In older records it could be the playing surface has just dried out and become brittle. I also read that the friction of the tip in the groove causes enough heat to temporarily soften the groove wall. If this is true then some of the accumulated crud in the grooves could become physically bonded to the groove wall making it impossible to remove.

Just a hunch. 

@invictus005 - Wow...  Maybe you just don't know what you're trying to clean.   

I mistakenly called a degreaser like Dawn or Tergitol a surfactent when it is a detergent. A surfactant, like Photoflow, is a wetting agent- reducing the surface tension of water allowing it to penetrate deeper into the grooves.

My apologies.

voiceofvinyl....Congrats for clearing up your statements about what chemical is a degreaser and which is a surfactant. In my earlier post I tried to explain how Photo Flo is used in the final rinse of photographic and xray films to eliminate drying spots. As others have mentioned, a very small amount of surfactant is needed to perform it's job. As a final rinse it is added to a large volume of distilled water.I know very little about wet cleaning of vinyl. I only know that the purpose used on films is to eliminate drying spots. If it could enhance the effectiveness if the detergent/degreaser during the actual cleaning process due to the "wetting" properties...I don't know. Perhaps others may be interested enough to conduct their own experiments.I'm not a chemist. I mentioned in my earlier post that some of the more popular dishwasher detergents include a wetting agent in their product to minimize drying spots on dishes. Whether that addition of the wetting agent also helps in the actual cleaning process...again I don't know.Sounds like an ambitious person may be curious to experiment.

The label on my 91% Isopropyl says the other 9% is distilled water. Since we’re all diluting our various alcohol formulations with distilled water anyway, why does 9% already added make Isopropyl unsuitable? Does it contain other impurities? Is the distilled water it contains not distilled enough?
Not criticizing, seeking knowledge.
BTW, have you tried making coffee with distilled water? It’s quite different: pure coffee flavour, with no added mineral tastes. I love it... but coffee is a very personal thing...