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

Zombie thread comes ALIVE...
Sadly I bought a used SACD ($3 so not a big deal) but I destroyed it, not knowing it would start to craze from a kitchen sink wash, polish. Sadly not only did it start to craze immediately, as I kept at it, the formed gunk would clear off in spots revealing a perfect layer underneath, only to have that layer start to get messed up. At first I thought it was some sort of protective stuff, perhaps added by previous owner. Nope.. as layer after layer of perfect newly exposed surface went bad.. Finally I read up on SACD and polishing them. Found this thread.
So mainly want to warn used SACD buyers. Some of them cannot be polished, cannot be washed with detergent.
Never had this experience before. but never bought used SACD either...

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)