Green residue?

A green residue keeps appearing on the rf shield over time on my puck.js, has anyone else had this happen? What is it?

It cleans off easily with isopropyl alcohol

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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

I've always seen this same deposit on the puck after some time inside the silicon cover. As far as I can tell, no damage inside the module. Sometimes I clean it but to be honest I do not take this too seriously. You can add some tape on the RF shield to isolate it from the silicon cover it should protect it

Wow, that's really strange - out of interest what colour covers do you use? maybe there was some manufacturing residue left on them?