https://www.ghsstrings.com/products/...cants-cleaners
Straight up the best thing I’ve tried for fret conditioning/polishing. Best thing is you don’t need to tape the fretboard because it’s also made to condition the fretboard. I’ve used this on guitars that were tossed away in closets and developed heavily oxidized frets to a highly shiny and smooth finish.
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There's a generic version of Gorgomyte called Miracle Cloth available on Amazon.
I discovered it when Gorgomyte disappeared for a while after Jimmy Johnson passed away.