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Having worked my way through an engineering degree as a lab manager for an optical lab, this looks like what happens to an A/R (anti-reflective) coating when harsh cleaning chemicals are used (Windex, etc...).

On mine, I would just use a water-dampened, clean, soft towel if I need to clean my screen. And by clean towel, I mean clean. I don't even set it on the counter as it can pick up particulate matter. And by soft, I mean never a paper towel. Ever.

Yes this is what Apple says. The fact is that all screens have serious structured patterns imprinted from the keys - independent on the cleaning method.

When you say picky what do you use? Shouldn't you just use water?

Yeah, mostly just water. My (now ex) officemate had something else he was using for a while without problems, so I used that sometimes, too.