What is the best thing to use for cleaning the screen? I sneezed and some stuff got on my monitor. So I took a tissue and wiped the screen which is what I normally do, and most of the time my screen will be fine. However, now I have a problem. I wiped my screen and there is this really thin steak (that looks rainbow colored) that I can't get rid of. I even tried smudging it with my finger to see if I could smudge it, but nothing changed. Please don't tell me it's a scratch, but I don't understand how it could be if it is. I used a clean tissue and nothing was scratching when I wiped the monitor. So what can I do? What's the best way to clean a monitor screen?