i use a micro fibre cloth,just wet the cloth a little with a plant spray bottle full of water,do it once a week,brings the screen, case and the glass tv stand up a treat with no scratches in site,you can get the microfibre cloths ina two pack from tescos for 97p and they are washable but for the money i just replace them every couple of months
i also read on a website that to keep dust away try putting a little comfort or lenor in a bowl of warm water and put the microfibre cloth in it and wring it out so as all the excess water is out then clean the screen tv satnd the lot,as fabric conditioner is anti static its supposed to repel dust
hope this helps