Usually a little bit of water on a lint free cloth will do the trick. Sometimes something a little more powerful than water is need for heavy finger printers for example. I use some wipes I found at my local Wal-Mart store. Never use ammonia, ammonia-based cleaners, or strong cleaners which can remove the glare coating from LCD and CRT monitors. I prefer pre-moistened sheets to sprays. Sprays have the potential to leak through the LCD around the sides thus causing problems.