Has anyone ever used a dvd lens cleaner? Do they work? My ps2 won't read dvds anymore (even ones that I know have worked in the past) and I'm hoping that the lens is just dirty. It still plays games just fine thankfully. Or am I better off just popping it open and cleaning the lens myself with a bit of canned air and rubbing alchohol? My warranty is already voided because I know my ex had popped the ps2 open a few months ago. Any other suggestions? thanks!