Quote:
I tried dissolving the solder mask already but acetone simply cleans it.
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Ah so ...
The doomsday prophets where wrong, there will not be only cockroaches left.
There will be cockroaches sheltering under thin films of Amazon Kindle solder mask.
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Bring out the MEK.
Just try not to melt the SoC with it.
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Seriously -
Use a hypodermic syringe with a very fine needle to put a drop just where you want to scrub (with a q-tip?).
Your sources would be an animal feed store or a human pharmacy - just ask for u-100 syringes, they come in a pack of 10 - no prescription needed.
Be quick - expect the MEK to melt the disposable syringe nearly as fast as the solder mask.