Some notes when I tried to more formally clean something and observe what worked and what didn't.
I don't recall what cleaning I did right after decap. I also didn't take a picture before the first acetone shake.
Then tried ultrasound and it removed a few larger objectects
Presumably those were lose and the small parts still there are the locations there were attached
This may indicate that the sample needs further acid treatment to be really clean
Then tried doing a standard lens clean with acetone + lens tissue
dropped it onto the metal stage below, but it landed right side up and so I don't think this contributed to any contamination
About the same, one particle appeared and one dissapeared or so
Ultrasound was more effective at removing large particulates than high pressure acetone.
Ultrasound does not effectively remove undissolved epoxy but it can be removed by wiping
Tearing lens tissue for smaller allotments is a bad idea as it generated particulates. The sheet should be used whole and moved around if it is to be used multiple times.