There are a few different things that you can use to clean a computer screen. One option is to use a microfiber cloth. You can either dampen the cloth with water or use a cleaning solution. If you use water, make sure to wring out the cloth well so that it is not dripping wet. You can also use a dryer sheet to clean the screen. Simply hold the sheet against the screen and move it around. Another option is to use a newspaper. Roll the newspaper up and use it to clean the screen.