I asked this on the EFF board before I realized they have a CD board! I'm so observant
We bought a bunch of these bottles at Home Depot on clearance and I'd love to use it for our CDs if we can. It's called Martha Stewart Clean detergent. It's free & clear. The first ingredient is water, the next three are mild cleansers, the fifth a chelator (have no idea what that is), and the sixth a thickening agent.
Here are the ingredients aside from water: sodium methyl 2-sulfolaurate, disodium 2-sulfolaurate, lauramidopropylamine oxide, tetrasodium iminodisuccinate, and hydroxyethylcellulose.