is it safe to clean records with isopropanol ?

TechSpray is 99% pure isopropyl. It indicates it is safe on
plastics(whether they're in lp records or not), non
corrosive and rapidly evaporating. I've never noticed any
ill effects on the sound of lp records using a mix
containing 25% TechSpray and 75% distilled, triple deionized
lab water. After applying the mixture, I use the VPI 16.5
to clean and vacuum.

I'm not sure what chemicals are in my Spin Clean fluid, but I can say it makes a terrible margarita.

I use what Opus uses, except I add a few drops of a non-ionized detergent per liter, Triton X100 is one example. I can say I have had no issues, but how would one know, unless the damage was rapid and gross? One is hardly doing a controlled study of record cleaners. Safe to say that the LP does not dissolve before my eyes.

I did once compare the above solution to the enzyme-based cleaners sold by Walker, which of course involve no alcohol. I cleaned side A of one of my favorite LPs with the Walker Audio stuff and side B with my standard solution (using a VPI HW17 machine). The results were very very slightly in favor of the Walker enzymes, but I concluded that my standard solution was faster and simpler. So I stuck with the latter, but the results suggest that there was no gross damage done by either method. That's the limited evidence I have to go on.

"I can say I have had no issues, but how would one know, unless the damage was rapid and gross?" True...and I agree with you, Lew. The way I see it, as an approximately 70 year old fart, my hearing is a fair cry from what it used to be, though I'm still enjoying what I AM hearing, and as long as that's so, I'm good. Best wishes with the hope you're enjoying the music too!

So what does isopropyl alcohol do that a mild soap / detergent solution doesn't? When I want to remove grease, dirt, slime, residues and other contaminants, I use soap and water and rinse with clean water. What does alcohol do better.