Mapleshade has a couple of excellent products which can not only get it off, but substantially improve the sound. Check their website for tweeks and call there tech line if you have questions.
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The eyeglass cleaner with lint free cloth (or microfiber) is about the cheapest wa to do it. You can get both at Sam's club or Walmart, which can keep the price down.
The next level up is probably the Novus cleaners, which are for polycarbonate surfaces, which is what CDs are. They also have a scratch remover that works pretty well. But the stage one clean with a lint free or microfiber cloth will be all that you need to remove fingerprints and smudges.
The next level up is something like the mapleshade cleaners. But if you're going to go that far, also get their ionoclast gun which will remove static buildup from the application of the cleaner (plus the static buildup that was already present on the CD). The effects of ionoclast should be audible in most resolved systems with a trained ear.
Oh yeah, wipe the cleaners off in a raduis patter away from the center hole to the edge. Never wipe them concentrically. That can damage them.
I use the Micro Smooth on all my CDs, new or used regardless of the age. I have also found that the harder you scrubb (and longer) the better the results. Be careful though to rinse the CDs VERY thoroughly. I basically use all the other Mapleshade tweeks and feel that the results are cumulative. I also use the Optrix in conjunction with a Bedini defluxer. The rotation of the Bedini unit uniformly applies the liquid and results in an audible improvement.
In addition I use the Denon Demagic disc to remove system magnetic build-up.
I know this can sound a little weird, but if you have 30K + in your system... details do matter.