I have a touchscreen phone (samsung glyde) has fingerprint shaped scratches. They look like my thumb print except they dont come off, and are made up of a bunch of little scratches. I tried to wash them with water and soap, which didn't work. How do I get them gone? I don't see how my thumbs could possibly leave scratches like this. I know I was eating cheese popcorn that day so possibly it's just dried stuff? But it won't come off...help please.?