I understand where you are coming from, but stand back for a minute and contemplate how ridiculous this sounds:

> don't be surprised if rubbing tap water on your glossy screen screws it up.

I used tap water to remove e-cigarette refill fluid (an oily substance) that I spilled on a non-Apple glossy screen, using a dirty rag. Unsurprisingly the screen is still absolutely perfect and handled the highly corrosive water just fine.

Apple's bullshit is getting to you.