So I cleaned the outside of my Late 2013 21.5" iMac with rubbing alcohol (70% isopropyl alcohol), including the screen and around the edges of the screen. It took 3-4 tries with a paper towel soaked in the rubbing alcohol to get it squeaky clean again (I have a skin condition that requires me to put lotion on my hands/forearms and over time the lotion managed to get all over the screen and around the edges of the iMac from moving it around). The paper towel wasn't wet enough to drip, but very close to it. My iMac had a very visible film of rubbing alcohol residue all over it after I finished wiping it down with the rubbing alcohol, which I cleaned up with a dry cloth. I used the rubbing alcohol straight out of the bottle onto the paper towel - did not dilute it. Prior to doing any of this I had called Apple to see what kinds of cleaners I could use on my iMac. The woman on the customer support line said I could use rubbing alcohol to clean off the screen, which didn't seem to be that unusual to me since I've heard of people cleaning electronics with it before. ---------------------------------------------------------------------------------------- So, after I cleaned my iMac it seemed like the screen was more difficult to read and see details, and for the first time I actually noticed individual pixels without looking for them. I was worried that I might have done damage to it, so I called Apple again and spoke with a different customer service rep. He was shocked that I had been told by another Apple customer service rep to use rubbing alcohol to clean my iMac. He told me that rubbing alcohol can "soak through" the glass on the screen, and damage the LCD behind it - but I'm skeptical of this because it doesn't make sense to me that glass could be porous. He told me that rubbing alcohol can even damage internal components, and that in his many years of computer repair experience he would NEVER recommend using rubbing alcohol on any electronics or computers, period. After doing some research on my own I found out that Apple is putting a special coating on the screens of these current iMacs, which is supposed to reduce glare. I never really paid much attention to the glare on my screen prior to cleaning it, but I wonder now if the rubbing alcohol removed this anti-glare coating (since I had to wipe it down 3-4 times to get all the lotion residue off), the lack of which may be causing my eyes to have more difficulty reading and seeing details on the screen, in addition to making the pixels easier to see? What do you guys think? Could I have damaged this coating by cleaning with rubbing alcohol? Also, I didn't realize that the small gap between the screen and the body/shell of the iMac wasn't sealed completely. I'm concerned that excess rubbing alcohol (which there was) may have gotten into the gap and damaged the adhesive holding the screen on and even possibly the internal components? If this is the case, how would I know if any of the components have been damaged? Is there some sort of self-test that I can run to verify that all the hardware is running up to their proper/maximum performance specs? I know I might seem a little bit too worried, but this is seriously the most expensive piece of electronic equipment I've ever owned (special ordered directly from Apple @ $2k), and I want to make sure I haven't damaged it. Thanks!