I'm not sure if this is the best advice, but I do it and it seems to have worked well for me over the years: I go to my local hobby store (model trains) and buy a bottle of "Rail Zip". You apply it with a cotton swab, then wipe it off 24 hrs later with a rag or cotton swab moistened in water (I use distilled). Cost is about $5.oo a bottle which will last for years, I clean my cables about every 6 months or so. Happy listening.
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