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Cleaning off flux pen residue

1340 1 Oct 26.2019, 10:44:16

So I’ve got my first batch of boards and have populated them meticulously by hand. I’ve used a rosin based no-clean flux pen to do the work. I’ve cleaned up with 99% IPA and a soft toothbrush then rinsed with distilled water and dried with compressed air.
However the surface of the board is still slightly sticky after this process.  Is there a better way or product to clean the boards with?

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