What's wrong with them? Do they play at all? Maybe just need to be cleaned? Do you smoke?
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"...So is washing panels an ML sanctioned thing?..."
Probably not but what do you have to loose? Many have done this successfully.
MartinLogan | Help Articles : Features and General Questions for Electrostatic Speakers
Martin Logan Quest Stator Panel Shower Washing (martinloganowners.com)
As a former SL3 owner until last July I would say if these are the original panels they are probably past done their useful service. I had mine from 1998 ( repanel 2010) to present. They still sound great but decided to get 11A's when ML had the sale last July.
Repaneling is costly. I am awaiting CLS panels($ 2995) which took 5 months. I have the same issue , washed them, no difference. Just a dead panel that is 20 yrs old.
Suggest looking at the new ML's as the new panels have improved, better bass integration,etc. Good luck