I've just bought a second hand ACD 20" screen. It's great. I've scratched it. That's not great. Luckily it's not so bad, a couple of marks at the top right hand corner where my curtain rail fell on to it during the night. Anything i can buy / do? Cleaning cloths don't work, is iKlear any use to me? Bear in mind i can physically feel these scratches with my finger.