Several years ago I purchased the iKlear Complete Cleaning Kit which comes with:
- 1 - 2 oz. iKlear Spray Bottle
- 1 - 6 oz. iKlear Spray Bottle
- 1 - Large "Chamois" Cloth
- 1 - Travel Size "Chamois" Cloth
- 1 - Medium DMT Antimicrobial Cloth
- 1 - Travel Size DMT Antimicrobial Cloth
- 12 - iKlear Travel Singles
You can buy it on Amazon for just under $19 [prime eligible].
They claimed at the time that it was the exclusive product used at the Apple Genius Bar. I'm not sure if that's still true, but I've definitely seen it in use at Apple Stores. I've been very happy with it, and it has lasted a long, long time. ("How long?" you ask. Well, let me put it this way, I bought it for my PowerBook.)
The nice thing about it is that you can use it to clean the glass and the body of the Mac too.
(Non-Disclaimer: I'm not connected to the company in any way other than a paying customer.)