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I have and use two ASI 1600MM cameras.
To clean the sensor, after removing the cover glass, I use a spatula made from a plastic credit card, cut just wider than the chip.
I use Kimwipes and IPA. Folded the wipe to a double folded strip, fold tightly over the spatula and a spray of IPA.
One wipe across the sensor, and dump the wipe.
If need be repeat.....
To check and verify the sensor is clean, I use a flat image taken with a bright sky at >f15.
Works for me.
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