Heres a quick and simple tip that I can fully recommend. Don’t buy alcohol/chemical based screen cleaning wipes that claim to be designed for laptop or TFT screens. If your screen gets marked from finger prints or splashes from coughs/sneezes I only ever recommend using a clean micro-fibre cloth. You can buy these at any supermarket in the house hold section for less than a couple of pounds and they will last a long time if you keep them clean.