Thought I would tell you about a cleaner for screens I bought its called [Real Cable, clean & care] I have used many a product but never really been that impressed but this product is very good it cost a tenner, you get a cleaning fluid, cloth, and a very handy brush to clean in those corners of the frame which are a nightmare, but the results are very impressive, I have seen a few recomendations on how to clean screens one being a damp cloth with soapy water, this is a big no no as this can damage the coating on the screen over time, there are loads of products out there, very good ones as well, but this one is the best I have used.
Here is a link for info
http://www.real-cable.com/nos-produits/accessoires/kit-de-nettoyage/ckb200fs-139.html
Here is a link for info
http://www.real-cable.com/nos-produits/accessoires/kit-de-nettoyage/ckb200fs-139.html