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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
That's an odd one - I've never seen that before! Does it clear off completely? It looks like corrosion, so you'd expect that the metal shield might look a bit damaged after.
Is there a possibility that the PCB inside is getting damp at all?
And is this the Puck of yours that went through the washing machine 3 years ago? https://forum.espruino.com/conversations/358498/ It looks like it's the same revision.
If so, I'd make sure you give it a really good rinse out with water (maybe leave it to soak for a bit) and make sure it's left for a week on a radiator to really dry out. It's probably still got some of the detergent in it