is it safe to clean records with isopropanol ?

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.

There's quite a bit of difference between what alcohols do and what mild detergents do, and fortunately for us, the thread that best described the differential effects of the various potential components of a record cleaning solution seems to be "alive" again. Look down the Analog Discussion page and find the thread on record cleaning solutions. The first post is a very useful summary of good research on the subject by a guy who obviously knows some chemistry.

The heading for the thread: "A very long primer on record cleaning fluids"

If you regularly imbibe your alcohol-based record cleaner, you will not live to own your LPs as long as Mosin, or I. Alcohols with longer aliphatic side chains, like isopropanol (vs ethanol or methanol), will be more or less hydrophobic and have different properties as a solvent therefore, I think. Isopropanol, for example, may be better at removing fatty deposits from finger-prints, compared to Grey Goose.