We had significant flooding in the Chicago area last week and I picked up a Marantz 2270 out of the trash today dripping wet. I put a high velocity fan in front of it for a couple of hours and just like the old ad from the 70s it powered up! It has weak output but it works .
There is available electric motor cleaning solvent. I saw a demo years ago where they put a very dirty 480V AC 3 phase motor into the bucket as it was running and it got unbelievably clean.
Looked almost like new when done. I often wonder if this solvent used properly with out current being applied of course, could clean electronics.
I dont think so, but seeing as my great grandpa was a alcoholic recluse who didnt talk about family and has been dead for nearly 60 years, theres no telling, John could have been his nephew or brother