Is it possible? Never had to do so until now, and my Vita appears to have one on my screen and I haven't even got a clue where it came from

But can you? If yes, how's the best method? I remember with PSP (not that I needed it, but I read it on a dutch forum somewhere) that someone used a product on his screen which removed the scratch... So I was wondering if there's such a thing and if yes, which product/what way/how D: