Harry Pearson's comments regarding .....

According to HP, they also make an agent for cleaning CDs.

I use Optrix for cleaning CDs and am quite satisfied with it. I use it primarily to clean up used CDs that I pick up. It does what it is supposed to do...clean the disc and not leave a residue. They sound as good as new on my Wadia.

L'Art du Son LP cleaning fluid is said to be outstanding, and it may be logical to project that the CD fluid should also be very good. Reports are that Audiotop CD fluid is excellent as well. Lower cost yet effective CD treatment solutions include Optrix and Esoteric Mist. And don't forget Nordost Eco3 on the label side of your discs.
Brian

When you clean a CD all you're cleaning is polycarbonate.
Mix up a weak solution (10-1) of distilled water and cheap shampoo in a spray bottle. Use a cotton towel and not paper when doing the cleaning.
Then you'll have something with which to wash the windows inside your house with as well.

Well, may be worth jumping in here on this topic.
I use Record Research Labs Shine Ola.

It has had positive professional and many user reviews and is most importantly safe on your CD's and SACD's.
There are a lot of stories on the audio forums about cleaning fluids and home brew ideas that end up causing damage (Armor All, etc.)

I do hear a difference when using Shine Ola (more focus), but whatever you use, make sure it is safe.