Sup guys, sorry if this question has bin answered before but Chrome is giving me a weird error when I try to search for something. So I bought a pre-owned copy of Kingdom Hearts 2 but I can't get it to work. I've cleaned it a few times but when I put it in my PS2 it says please insert the format disk. There's no deep scratches, just one small mark that looks as if it was spilled on the disk. I can't get it off by rubbing it, so I was wondering if anyone has any advice on what to use?

Cheers,
Josh.