[header] How to clean a flat screen tv [title] Turn the tv off. [step] You don't want to interfere with any pixels while they're still firing, and turning off the tv will enable you to see dirt, dust, and grime better since you're working with a dark surface. [title] Find a microfiber cloth. 
[step] These soft, dry cloths are the same type of cloth you would use to clean eyeglasses. They're perfect for lcd screens because they don't leave lint.