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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Odd about the NFC. Does the Puck actually look clean? If it's still got traces of washing powder on it, that might cause a resistance between contacts somewhere which would stop NFC from working properly I guess.
On Puck.js v2 the NFC is mainly on tracks sandwiched inside the PCB, so it's unlikely they got damaged - however I guess the PCB may have absorbed water? I'd be surprised though.
While the button is off it you could try soaking the whole thing in distilled water for a few days to try and flush out any impurities.