Can't remember if we have discussed this in this thread yet, but I clean most chains before I sharpen . . . . (pause for gasps, snorts, pearl clutching, eye rolls, etc. . . . . ). Described it at length in 'that other forum'.
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Soak 30 seconds or so in 50:50 mix of this stuff (water based degreaser *
with sodium hydroxide -aka 'lye');
hit with old toothbrushes on an old plastic cutting board;
repeat if needed - use stainless steel 'scratch brush' for light rust;
dry 15 minutes in 200°F oven on old cookie sheet (or hit with compressed air);
inspect / repair / sharpen / etc;
spray liberally with WD-40 to remove any remaining water and to provide a thin lube film.
https://www.arboristsite.com/community/threads/philbert-meets-the-stihl-rs3.202969/
Cleaning lets me inspect the loops for any damage, cracked tie straps, mis-installed repair parts, etc, as well as making sharpening easier. Taken a lot of cr*p for 'cleaning chains' in these forums, but some of the ones I get look like they are caked in asphalt. I like to return them in close-to-new condition.
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Philbert