[gmku]

I use dish soap, warm water, pure alcohol, and very soft artists brushes. I have a whole regimen where I scrub with the soap and warm water, from the faucet, wipe dry with a clean lint-free cloth, then go over them with the alcohol with another brush, wipe that clean, and they're good. I do this for anything used I buy and for anything I haven't played in years. Cleans them up so much they are virtually noise-free.

Also take good care of your stylus. Keep that clean, too.