SACD Warning--"Do not use liquid cleaning..." ?

The SACDs that were easily damaged were a different material than the rest. All the companies using the stuff have stopped. But those old used easy to damage ones may be floating around in the used bins with NO WARNING on them.  
From my experience the 'easy to damage' seem to be made up of very many thin layers stacked up, vs one (two for SACD) thicker layer of the vast majority of CDs and SACDs (which have no problem being polished)

I clean all my discs with distilled water and a tiny amount of pure liquid soap, just to break the surface tension of the mold release

I used to use various cleaners and polishers but over time they oxidize and roll everything off. Not a big eal, as simple to wash, repeat

I admit that I never clean discs unless they won’t track.  With CDs I use isopropyl alcohol and wipe with the tissue that opticians sell for Frac lenses and that has always worked.  Although I own over a hundred SACDs I don’t remember having to clean one until I had loaned a recording of Mahler/5 to a fellow Audiophile who wanted to explore both the Composer and SACDs (Zander/Philharmonia on Telarc)).  When he returned it he said that he had cleaned it with some special highly touted commercial cleaner that was expensive and he only reserved for his finest discs.
  The disc was unplayable, in 3 different players, on either the SACD or the CD layer.  After letting it sit for a few days, with no improvement, I tried isopropyl and it was fine.