When I worked at the Apple Store, I effing HATED closing and having to clean the Air screens. That "ideal middle" you're talking about is a total PITA to clean when they have tons of fingerprints on them.
We used iKlear and a microfiber towel. Whereas it'd take literally 2-5 seconds to clean off any of the notebooks w/ glass screens, it'd take 20-30 seconds to really get the Air screens clean. But they did eventually come clean.
That's what I'll be using on my personal Air. Oh, and smacking anyone that tries to touch the dang screen!