I intend on just using a soft cloth with a small amount of water. I have been told to use those things before but I was a bit unsure, I though that water would just increase the amount on smudging.
I use whatever the cleanest cotton item i have sitting next to me. Usually either just a towel that i dampen or a sock. As whirlwind stated, never spray the display, just wet the towel.
I always get smudges on my screen also. In the middle of the night little gnats always are landing on my screen. I have to squish them or else they would get so annoying. Anyways i just cleaned my monitor using a damp cloth and it works perfectly fine. Doesn't really matter what kind of cloth it is. Just make sure it isn't to coarse.