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I have a set of those and they're pretty good. I wish they'd made the colours more distinct though - it's nigh impossible to know the right order to work through. They're good for removing scratches in FitBit screens as well. But they do clog up and they're a bit pricey once you've imported them. Really fine sandpaper with cloth backing would probably do the same for a few quid.
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I was wondering about wet&dry paper or scotchbrite. Alternatively I wonder if Scalextric/Model Railway track rubbers might be up to the job, or even one of those dual compound pencil/ink erasers.
My frets are a state. Are these kind of pads the best thing to use to polish them up if I want to avoid wire wool?
https://www.stewmac.com/luthier-tools-and-supplies/supplies/sanding-and-polishing/micro-mesh-soft-touch-pads