After about 1-1/2 years in storage, I've dug out my DIY ultrasonic cleaner and fired the cleaning beast back up.   After 30 min cleaning in a distilled water, x-10 and 99% ipa mixture I use the record spin-clean as a rinse cycle with distilled water and just a touch of ipa.   For those of you interested, there is a long thread on this when I brought it to life about 3 years ago.  Included are microscope before and after.